Dan Twelker

Interests

Teaching

I enjoy teaching clinical procedures such as retinoscopy and refraction. I fit contact lenses, both soft and rigid gas permeable.

Research

I am site Principal Investigator of the CHAMP Myopia Study, a clinical trail of 2 concentrations of dilute atropine versus placebo.

Courses

No activities entered.

Scholarly Contributions

Journals/Publications

• Zadnik, K., Schulman, E., Flitcroft, I., Fogt, J. S., Blumenfeld, L. C., Fong, T. M., Lang, E., Hemmati, H. D., Chandler, S. P., & , C. T. (2023). Efficacy and Safety of 0.01% and 0.02% Atropine for the Treatment of Pediatric Myopia Progression Over 3 Years: A Randomized Clinical Trial. JAMA ophthalmology, 141(10), 990-999.
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  The global prevalence of myopia is predicted to approach 50% by 2050, increasing the risk of visual impairment later in life. No pharmacologic therapy is approved for treating childhood myopia progression.
• Mutti, D. O., Sinnott, L. T., Brennan, N. A., Cheng, X., Zadnik, K., & , C. L. (2022). The Limited Value of Prior Change in Predicting Future Progression of Juvenile-onset Myopia. Optometry and vision science : official publication of the American Academy of Optometry, 99(5), 424-433.
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  Identifying children at highest risk for rapid myopia progression and/or rapid axial elongation could help prioritize who should receive clinical treatment or be enrolled in randomized clinical trials. Our models suggest that these goals are difficult to accomplish.
• Jones-Jordan, L. A., Sinnott, L. T., Chu, R. H., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Mutti, D. O., Twelker, J. D., Zadnik, K., & , C. S. (2021). Myopia Progression as a Function of Sex, Age, and Ethnicity. Investigative ophthalmology & visual science, 62(10), 36.
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  To model juvenile-onset myopia progression as a function of race/ethnicity, age, sex, parental history of myopia, and time spent reading or in outdoor/sports activity.
• Kleinstein, R. N., Mutti, D. O., Sinnott, L. T., Jones-Jordan, L. A., Cotter, S. A., Manny, R. E., Twelker, J. D., Zadnik, K., & , C. L. (2021). Uncorrected Refractive Error and Distance Visual Acuity in Children Aged 6 to 14 Years. Optometry and vision science : official publication of the American Academy of Optometry, 98(1), 3-12.
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  This study presents the relationship between distance visual acuity and a range of uncorrected refractive errors, a complex association that is fundamental to clinical eye care and the identification of children needing refractive correction.
• Walline, J. J., Lindsley, K. B., Vedula, S. S., Cotter, S. A., Mutti, D. O., Ng, S. M., & Twelker, J. D. (2020). Interventions to slow progression of myopia in children. The Cochrane database of systematic reviews, 1, CD004916.
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  Nearsightedness (myopia) causes blurry vision when one is looking at distant objects. Interventions to slow the progression of myopia in children include multifocal spectacles, contact lenses, and pharmaceutical agents.
• Dennis, L. K., Twelker, J. D., Miller, J. M., Davis, A. L., Romer McGrath, E. F., & Harvey, E. M. (2018). A Preliminary Study of Astigmatism and Early Childhood Development. Journal of AAPOS.
• Dennis, L. K., Twelker, J. D., Miller, J. M., McGrath, E. R., & Harvey, E. M. (2018). A Preliminary Study of Astigmatism and Early Childhood Development. Journal of American Association of Pediatric Ophthalmology and Strabismus.
• Harvey, E. M., McGrath, E. R., Miller, J. M., Davis, A. L., Twelker, J. D., & Dennis, L. K. (2018). A preliminary study of astigmatism and early childhood development. Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus, 22(4), 294-298.
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  To determine whether uncorrected astigmatism in toddlers is associated with poorer performance on the Bayley Scales of Infant and Toddler Development, 3rd edition (BSITD-III).
• Harvey, E. M., Miller, J. M., Davis, A. L., Twelker, J. D., & Dennis, L. K. (2018). Spectacle Wear in Toddlers: Frequency of Wear and Impact of Treatment on the Child and Family. Translational vision science & technology, 7(6), 43.
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  We assessed the frequency of spectacle wear and impact of spectacle treatment in toddlers.
• Harvey, E. M., Leonard-Green, T. K., Mohan, K. M., Kulp, M. T., Davis, A. L., Miller, J. M., Twelker, J. D., Campus, I., & Dennis, L. K. (2017). Interrater and Test-Retest Reliability of the Beery Visual-Motor Integration in Schoolchildren. Optometry and vision science : official publication of the American Academy of Optometry, 94(5), 598-605.
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  To assess interrater and test-retest reliability of the 6th Edition Beery-Buktenica Developmental Test of Visual-Motor Integration (VMI) and test-retest reliability of the VMI Visual Perception Supplemental Test (VMIp) in school-age children.
• Harvey, E. M., Leonard-Green, T. K., Mohan, K., Kulp, M. T., Davis, A. L., Miller, J. M., Twelker, J. D., Campus, I., & Dennis, L. K. (2017). Interrater and Test-Retest Reliability of the Beery Visual-Motor Integration in Schoolchildren. Optometry and Vision Science, 94(5), 598-605.
• Harvey, E. M., Twelker, J. D., Miller, J. M., Leonard-Green, T. K., Mohan, K. M., Davis, A. L., & Campus, I. (2017). Visual Motor and Perceptual Task Performance in Astigmatic Students. Journal of ophthalmology, 2017, 6460281.
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  . To determine if spectacle corrected and uncorrected astigmats show reduced performance on visual motor and perceptual tasks. . Third through 8th grade students were assigned to the low refractive error control group (astigmatism < 1.00 D, myopia < 0.75 D, hyperopia < 2.50 D, and anisometropia < 1.50 D) or bilateral astigmatism group (right and left eye ≥ 1.00 D) based on cycloplegic refraction. Students completed the Beery-Buktenica Developmental Test of Visual Motor Integration (VMI) and Visual Perception (VMIp). Astigmats were randomly assigned to testing with/without correction and control group was tested uncorrected. Analyses compared VMI and VMIp scores for corrected and uncorrected astigmats to the control group. . The sample included 333 students (control group 170, astigmats tested with correction 75, and astigmats tested uncorrected 88). Mean VMI score in corrected astigmats did not differ from the control group ( = 0.829). Uncorrected astigmats had lower VMI scores than the control group ( = 0.038) and corrected astigmats ( = 0.007). Mean VMIp scores for uncorrected ( = 0.209) and corrected astigmats ( = 0.124) did not differ from the control group. Uncorrected astigmats had lower mean scores than the corrected astigmats ( = 0.003). . Uncorrected astigmatism influences visual motor and perceptual task performance. Previously spectacle treated astigmats do not show developmental deficits on visual motor or perceptual tasks when tested with correction.
• Mutti, D. O., Mitchell, G. L., Jones-Jordan, L. A., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Twelker, J. D., Zadnik, K., & , C. S. (2017). The Response AC/A Ratio Before and After the Onset of Myopia. Investigative ophthalmology & visual science, 58(3), 1594-1602.
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  To investigate the ratio of accommodative convergence per diopter of accommodative response (AC/A ratio) before, during, and after myopia onset.
• Davis, A. L., Harvey, E. M., Twelker, J. D., Miller, J. M., Leonard-Green, T., & Campus, I. (2016). Convergence Insufficiency, Accommodative Insufficiency, Visual Symptoms, and Astigmatism in Tohono O'odham Students. Journal of ophthalmology, 2016, 6963976.
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  Purpose. To determine rate of convergence insufficiency (CI) and accommodative insufficiency (AI) and assess the relation between CI, AI, visual symptoms, and astigmatism in school-age children. Methods. 3rd-8th-grade students completed the Convergence Insufficiency Symptom Survey (CISS) and binocular vision testing with correction if prescribed. Students were categorized by astigmatism magnitude (no/low:
• Harvey, E. M., Miller, J. M., Twelker, J. D., & Davis, A. L. (2016). Reading Fluency in School-Aged Children with Bilateral Astigmatism. Optometry and vision science : official publication of the American Academy of Optometry, 93(2), 118-25.
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  To compare oral reading fluency (ORF) in students with no/low astigmatism and moderate/high astigmatism and to assess the impact of spectacle correction on ORF in moderate and high astigmats.
• Twelker, J. D., Leonard-Green, T. K., Davis, A. L., Crescioni, M., Campus, I., Mohan, K., Miller, J. M., & Harvey, E. M. (2016). Convergence Insufficiency, Accommodative Insufficiency, Visual Symptoms, and Astigmatism in Tohono O'odham Students.. Journal of Ophthalmology.
• Harvey, E. M., Miller, J. M., Twelker, J. D., & Sherrill, D. L. (2015). Longitudinal change and stability of refractive, keratometric, and internal astigmatism in childhood. Investigative ophthalmology & visual science, 56(1), 190-8.
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  To assess longitudinal change in refractive, keratometric, and internal astigmatism in a sample of students from a population with a high prevalence of with-the-rule (WTR) astigmatism and to determine the optical origins of changes in refractive astigmatism.
• Zadnik, K., Sinnott, L. T., Cotter, S. A., Jones-Jordan, L. A., Kleinstein, R. N., Manny, R. E., Twelker, J. D., & Mutti, D. O. (2015). Prediction of Juvenile-Onset Myopia. JAMA ophthalmology, 133(6), 683-9.
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  Myopia (nearsightedness) has its onset in childhood and affects about one-third of adults in the United States. Along with its high prevalence, myopia is expensive to correct and is associated with ocular diseases that include glaucoma and retinal detachment.
• Crescioni, M., Messer, D. H., Warholak, T. L., Miller, J. M., Twelker, J. D., & Harvey, E. M. (2014). Rasch analysis of the Student Refractive Error and Eyeglass Questionnaire. Optometry and vision science : official publication of the American Academy of Optometry, 91(6), 624-33.
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  To evaluate and refine a newly developed instrument, the Student Refractive Error and Eyeglasses Questionnaire (SREEQ), designed to measure the impact of uncorrected and corrected refractive error on vision-related quality of life (VRQoL) in school-aged children.
• Harvey, E. M., Miller, J. M., Apple, H. P., Parashar, P., Twelker, J. D., Crescioni, M., Davis, A. L., Leonard-Green, T. K., Campus, I., & Sherrill, D. L. (2014). Accommodation in astigmatic children during visual task performance. Investigative ophthalmology & visual science, 55(8), 5420-30.
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  To determine the accuracy and stability of accommodation in uncorrected children during visual task performance.
• Jones-Jordan, L. A., Sinnott, L. T., Graham, N. D., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Mutti, D. O., Twelker, J. D., & Zadnik, K. (2014). The contributions of near work and outdoor activity to the correlation between siblings in the Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error (CLEERE) Study. Investigative ophthalmology & visual science, 55(10), 6333-9.
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  We determined the correlation between sibling refractive errors adjusted for shared and unique environmental factors using data from the Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error (CLEERE) Study.
• Twelker, J. D., Miller, J. M., Sherrill, D. L., & Harvey, E. M. (2013). Astigmatism and myopia in Tohono O'odham Native American children. Optometry and vision science : official publication of the American Academy of Optometry, 90(11), 1267-73.
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  To describe change in spherical equivalent (M) in a longitudinal sample of Tohono O'odham students ages 3 to 18 years and to test the hypothesis that astigmatism creates complex cues to emmetropization, resulting in increased change in M in the direction of increasing myopia and increased occurrence of myopia.
• Jones-Jordan, L. A., Sinnott, L. T., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Mutti, D. O., Twelker, J. D., & Zadnik, K. (2012). Time outdoors, visual activity, and myopia progression in juvenile-onset myopes. Investigative ophthalmology & visual science, 53(11), 7169-75.
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  To investigate the association between myopia progression and time spent outdoors and in various visual activities.
• Manny, R. E., Sinnott, L. T., Jones-Jordan, L. A., Messer, D., Twelker, J. D., Cotter, S. A., Kleinstein, R. N., & Crescioni, M. (2012). Predictors of adequate correction following vision screening failure. Optometry and vision science : official publication of the American Academy of Optometry, 89(6), 892-900.
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  To determine whether compliance with referral 1 year after vision screening failure was associated with care model, demographic, or ocular factors.
• Messer, D. H., Mitchell, G. L., Twelker, J. D., & Crescioni, M. (2012). Spectacle wear in children given spectacles through a school-based program. Optometry and vision science : official publication of the American Academy of Optometry, 89(1), 19-26.
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  To investigate factors associated with spectacle wear in a group of primarily Native-American children provided spectacles free of charge through a school-based vision program.
• Mutti, D. O., Mitchell, G. L., Sinnott, L. T., Jones-Jordan, L. A., Moeschberger, M. L., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Twelker, J. D., & Zadnik, K. (2012). Corneal and crystalline lens dimensions before and after myopia onset. Optometry and vision science : official publication of the American Academy of Optometry, 89(3), 251-62.
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  To describe corneal and crystalline lens dimensions before, during, and after myopia onset compared with age-matched emmetropic values.
• Jones-Jordan, L. A., Mitchell, G. L., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Mutti, D. O., Twelker, J. D., Sims, J. R., & Zadnik, K. (2011). Visual activity before and after the onset of juvenile myopia. Investigative ophthalmology & visual science, 52(3), 1841-50.
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  To investigate visual activities before and after the onset of juvenile myopia.
• Manny, R. E., Mitchell, G. L., Cotter, S. A., Jones-Jordan, L. A., Kleinstein, R. N., Mutti, D. O., Twelker, J. D., & Zadnik, K. (2011). Intraocular pressure, ethnicity, and refractive error. Optometry and vision science : official publication of the American Academy of Optometry, 88(12), 1445-53.
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  The ethnically diverse Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error (CLEERE) Study cohort provides a unique opportunity to explore associations among intraocular pressure (IOP), ethnicity, and refractive error while adjusting for potential confounding variables.
• Mutti, D. O., Sinnott, L. T., Mitchell, G. L., Jones-Jordan, L. A., Moeschberger, M. L., Cotter, S. A., Kleinstein, R. N., Manny, R. E., Twelker, J. D., & Zadnik, K. (2011). Relative peripheral refractive error and the risk of onset and progression of myopia in children. Investigative ophthalmology & visual science, 52(1), 199-205.
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  To investigate whether relative peripheral hyperopia is a risk factor for either the onset of myopia in children or the rate of myopic progression.
• Walline, J. J., Lindsley, K., Vedula, S. S., Cotter, S. A., Mutti, D. O., & Twelker, J. D. (2011). Interventions to slow progression of myopia in children. The Cochrane database of systematic reviews, CD004916.
  More info

  Nearsightedness (myopia) causes blurry vision when looking at distant objects. Highly nearsighted people are at greater risk of several vision-threatening problems such as retinal detachments, choroidal atrophy, cataracts and glaucoma. Interventions that have been explored to slow the progression of myopia include bifocal spectacles, cycloplegic drops, intraocular pressure-lowering drugs, muscarinic receptor antagonists and contact lenses. The purpose of this review was to systematically assess the effectiveness of strategies to control progression of myopia in children.
• Hargadon, D. D., Wood, J., Twelker, J. D., Harvey, E. M., & Dobson, V. (2010). Recognition acuity, grating acuity, contrast sensitivity, and visual fields in 6-year-old children. Archives of ophthalmology (Chicago, Ill. : 1960), 128(1), 70-4.
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  To measure monocular distance visual acuity (VA), grating VA, contrast sensitivity, and visual field extent in full-term, 6-year-old children.

Presentations

• Miller, J. M., Ober, C., Leonard-Green, T., Twelker, J. D., Kramer, T. R., Miller, H., Mercer, D., & Harvey, E. M. (2013, Jun). Comparison of Objective Measures of Visual Acuity for Assessing Potential Change in Vision Following Cord Blood Transplant in Preverbal Children. Annual Meeting of the International Cord Blood Symposium. San Francisco, CA: Cord Blood Association.

Poster Presentations

• Twelker, J. D., Harvey, E. M., Arthur, A. W., Dennis, L. K., Davis, A. L., Enriquez, S., Gerhart, K., Hsu, C., Marshall-Gonzales, M. S., Martin, J. A., Romer McGrath, E. F., Miller, J. M., & Divya, R. (2023, April). Agreement between the Welch Allyn Spot Vision Screener and Cycloplegic Retinoscopy in Toddlers.. ARVO. New Orleans, LA: ARVO.
• Twelker, J. D., Harvey, E. M., Arthur, A. W., Dennis, L. K., Davis, A. L., Enriquez, S., Gerhart, K., Hsu, C., Marshall-Gonzales, M. S., Martin, J. A., Romer McGrath, E. F., Miller, J. M., & Divya, R. (2023, April). Agreement between the Welch Allyn Spot Vision Screener and Cycloplegic Retinoscopy in Toddlers.. Association for Research in Vision and Ophthalmology Annual Meeting. New Orleans, LA: ARVO.
• Campus, I., Leonard-Green, T., Davis, A., Twelker, J. D., Apple, H., Miller, J. M., & Harvey, E. M. (2017, May). Perception of Global Form and Motion in Students with Bilateral Astigmatism. Association for Research in Vision and Ophthalmology Annual Meeting.
• Harvey, E. M., Harvey, E. M., Harvey, E. M., Leonard-Green, T. K., Leonard-Green, T. K., Leonard-Green, T. K., Mohan, K., Mohan, K., Mohan, K., Kulp, M. T., Kulp, M. T., Kulp, M. T., Davis, A. L., Davis, A. L., Davis, A. L., Miller, J. M., Miller, J. M., Miller, J. M., Twelker, J. D., , Twelker, J. D., et al. (2016, May). Inter-Scorer and Test-Retest Reliability of the Beery-Buktenica Developmental Test of Visual-Motor Integration in School-Age Children. Association for Research in Vision and Ophthalmology Annual Meeting. Seattle, WA.
• Crescioni, M., Crescioni, M., Warholak, T. L., Warholak, T. L., Harvey, E. M., Harvey, E. M., Leonard Green, T., Green, T. K., Campus, I., Campus, I., Twelker, J. D., Twelker, J. D., Miller, J. M., & Miller, J. M. (2015, May). Validation of Self-Reported Spectacle Compliance Among School Aged Children and Parents Using Rasch Analysis. Annual Meeting of Association for Research in Vision and Ophthalmology. Denver, CO: Association for Research in Vision and Ophthalmology.
• Davis, A., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2015, May). The Relation Between Convergence Insufficiency and Astigmatism. Annual Meeting of the Association for Research in Vision and Ophthalmology. Denver, CO: Association for Research in Vision and Ophthalmology.
• Crescioni, M., Warholak, T. L., Twelker, J. D., Miller, J. M., Davis, A. L., & Harvey, E. M. (2014, May). Rasch Analysis of the Convergence Insufficiency Symptoms Survey (CISS) Used to Assess Symptom Reduction with Spectacle Correction Among Students. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Davis, A. L., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2014, May). Inter-Observer and Intra-Observer Reliability of Measurements of the Obliquity of Palpebral Fissures. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Green, T. K., Davis, A., Crescioni, M., Campus, I., Mohan, K., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2015, May). Comparison of Best-Corrected vs. Uncorrected Performance on the Beery VMI Developmental Test of Visual Perception in Astigmatic Children. Annual Meeting of Association for Research in Vision and Ophthalmology. Denver, CO: Association for Research in Vision and Ophthalmology.
• Harvey, E. M., Miller, J. M., Apple, H. P., Parasha, P., Apple, D., Twelker, J. D., Crescioni, M., Leonard-Green, T. K., & Davis, A. L. (2014, May). Accommodation Patterns in Astigmatic Children During Visual Task Performance. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Leonard-Green, T. K., Apple, H. P., Apple, D., Crescioni, M., Miller, J. M., Twelker, J. D., Davis, A. L., Campus, I., & Harvey, E. M. (2014, May). Meridional Amblyopia in Astigmatic Students Documented with Computer Generated Stimuli on Commercial Displays. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Miller, J. M., Harvey, E. M., Twelker, J. D., Belin, M. W., & Sherrill, D. L. (2014, May). Posterior Corneal Curvature Conforms to Anterior Cornea Curvature in Astigmatic Tohono O’odham Native American Schoolchildren. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Twelker, J. D., Miller, J. M., & Harvey, E. M. (2014, May). Native American Schoolchildren Tend to Emmetropize to the Spherical Equivalent, Regardless of Level of Astigmatism. Annual Meeting of Association for Research in Vision and Ophthalmology. Orlando, FL: Association for Research in Vision and Ophthalmology.
• Campus, I., Crescioni, M., Green, T. K., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2013, May). Effects of Eyeglass Correction on Oral Reading Fluency in Elementary and Middle School Children. Annual Meeting of Association for Research in Vision and Ophthalmology. Seattle, WA: Association for Research in Vision and Ophthalmology.
• Crescioni, M., Twelker, J. D., Miller, J. M., Green, T. K., Campus, I., & Harvey, E. M. (2013, May). Relation Between Grade and Gender and Reasons for Spectacle Non-Compliance Among School Aged Children. Annual Meeting of Association for Research in Vision and Ophthalmology. Seattle, WA: Association for Research in Vision and Ophthalmology.
• Harvey, E. M., Twelker, J. D., & Miller, J. M. (2013, May). Relation Between Refractive Astigmatism and Change in Spherical Equivalent with Age in a Sample of Native American Children Age 3 to 18 Years of Age. Annual Meeting of Association for Research in Vision and Ophthalmology. Seattle, WA: Association for Research in Vision and Ophthalmology.
• Twelker, J. D., Miller, J. M., Messer, D. H., & Harvey, E. M. (2013, May). The Magnitude and Symmetry of Corneal and Refractive Astigmatism. Annual Meeting of Association for Research in Vision and Ophthalmology. Seattle, WA: Association for Research in Vision and Ophthalmology.
• Adams, I., Crescioni, M., Messer, D. H., Green, T. K., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2012, May). Test-Retest Agreement on the Student Refractive Error and Eyeglass Questionnaire (SREEQ). Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Crescioni, M., Messer, D. H., Harvey, E. M., Twelker, J. D., & Miller, J. M. (2012, May). Construct Validation of the Student Refractive Error and Eyeglass Questionnaire. Annual Meeting of the Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Green, T. K., Adams, I. A., Crescioni, M., Messer, D. H., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2012, May). Type of Refractive Error and Grade as Predictors of Spectacle Wear in 1st-12th Grade Students. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Harvey, E. M., Miller, J. M., Schwiegerling, J. T., Sherrill, D. L., Messer, D. H., & Twelker, J. D. (2012, May). Longitudinal Change in Corneal Astigmatism in Tohono O'odham Infants and Toddlers. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Miller, J. M., Schwiegerling, J. T., Harvey, E. M., Sherrill, D. L., Messer, D. H., & Twelker, J. D. (2012, May). Data Reduction Strategies for Aberration Measurements in Tohono O'odham Infants and Children. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Adams, I., Green, T. K., Messer, D. H., Twelker, J. D., Miller, J. M., & Harvey, E. M. (2011, May). Use of a Modified Version of the Pediatric Refractive Error Profile (PREP) to Identify Factors Associated with Eyeglass Wearing Compliance. Annual Meeting of the Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Apple, H., Miller, J. M., Harvey, E. M., Green, T. K., Messer, D. H., & Twelker, J. D. (2011, May). Accommodative Lag Changes in Uncorrected Astigmatic and Non-Astigmatic Students While Attempting to Read Small and Large Letters. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Green, T. K., Miller, J. M., Apple, H. P., Harvey, E. M., Messer, D. H., & Twelker, J. D. (2011, May). Evaluation of the Grand Seiko WAM and Apple Micro-Display for the Study of Accommodative Response to Near Stimuli. Annual Meeting of the Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Harvey, E. M., Miller, J. M., Belin, M. W., Messer, D. H., & Twelker, J. D. (2011, May). Agreement Between Retinomax K+ and Pentacam Measurements of Anterior Corneal Astigmatism. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.
• Miller, J. M., Seltzer, R. G., Sherrill, D. L., Harvey, E. M., Twelker, J. D., & Messer, D. H. (2011, May). Stability of Refractive Astigmatism in a Large Longitudinal Sample of Tohono O'odham Children. Annual Meeting of Association for Research in Vision and Ophthalmology. Ft. Lauderdale: Association for Research in Vision and Ophthalmology.
• Twelker, J. D., Robine, M., Mohler, J., De Castro, D. K., & Miller, J. M. (2011, May). Evaluating the Performance of a Lay Visual Health Worker in Rural Honduras. Annual Meeting of the Association for Research in Vision and Ophthalmology. Ft. Lauderdale, FL: Association for Research in Vision and Ophthalmology.