Contact Lenses
121 lenses
Quickly search and sort lenses by brand, replacement, oxygen permeability (Dk), and more.
All 121 lenses →Lens of the day
BC8.4
Dia14.2
Dk80
H₂O54.3%
Sph+8.00 to -12.00
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Medications
237 medications
All the information you need to confidently prescribe drops and drugs for ocular disease treatment.
All 237 medications →Drug of the day
Dextenza®SteroidInjections & Implants
GoodRx
Glossary
238 terms
From aberrant regeneration to zylonite, find concise definitions of ophthalmic terms and optical concepts.
All 238 terms →Term of the day
Orthophoria is the absence of heterophoria. Without an adequate fusion stimulus, the lines of sight still intersect at the point of reference, usually the point of binocular fixation.1 In this ideal fusion-free position, the visual lines are parallel for distance fixation and properly converged for near vision.2
Sources (7)
- Care of the Patient with Accommodative and Vergence Dysfunction (AOA clinical practice guideline), Glossary
- von Noorden and Campos, Binocular Vision and Ocular Motility, ch. 8
- Eperjesi and Rundström, Practical Binocular Vision Assessment, ch. 3
- American Academy of Ophthalmology. 2020. Strabismus Terminology. [online] Available at: <https://www.aao.org/education/bcscsnippetdetail.aspx?id=ce9b9c03-0bc8-4a63-8e51-09334c399fd7> [Accessed 6 May 2024].
- Noorden, G.K. and Campos, E.C. 2002. Binocular vision and ocular motility: theory and management of strabismus. 6th ed. St. Louis: Mosby.
- Rutstein, R. and Daum, K. 1997. Anomalies of Binocular Vision: Diagnosis & Management. St. Louis: Mosby.
- Von Noorden, G.K. 1996. Binocular vision and ocular motility: theory and management of strabismus. 5th ed. St. Louis: Mosby.
Calculators
5 calculators
Each calculator has its own page you can bookmark. Every result shows its work.
All 5 calculators →Try it · Back vertex power
mm
More calculatorsToric over-refractionDiopters ↔ radiusTranspositionHydroxychloroquine
Handouts
9 PDFs
Everything from Amsler grids for your patients to clinical guides and tables to use in your practice.
All handouts →Handout of the day
Tint and Filter Selection
2 pagesA guide for opticians: which tint or filter to offer for night driving, glare, sports, screens and light sensitivity, why it works, and what to say, with FL-41, Avulux and 41 linked sources.
NBEO®* Part I Prep
1,816 questions
Timed practice exams with worked explanations and a score breakdown by topic. The first half of Exam 1 is free.
Open exam prep →EyeKnow O.D. Pro adds 3 more full-length exams and custom drills from all 1,816 questions. $179 for 12 months, intro price to March 18, 2027. See Pro plans →
Question of the day · free, no account
Next: try the first half of Exam 1 The first half of Exam 1 is free, 185 questions
*EyeKnow O.D. is an independent study tool. It is not affiliated with, endorsed by, or sponsored by the National Board of Examiners in Optometry (NBEO®). “NBEO” is used here only to indicate exam coverage.
Optometry Schools
27 programs
Admissions, cost, board pass rates and campus life for every accredited OD program, side by side.
Compare all 27 →School of the day
St. Louis, MO · first class 1980
- Class
- 46
- GPA
- 3.50
- OAT
- 318
- Part I
- 74.2%
- Non-res. cost
- $246k
- Debt
- $200k