Try TabeebPlus fully for 7 days free!

Ophthalmology Clinical Calculators

Evidence-based ophthalmology calculators for glaucoma risk assessment (OHTS/EGPS), diabetic retinopathy severity (ETDRS/ICDR), AMD progression risk (AREDS), cataract grading (LOCS III), and visual acuity conversion.

Why This Matters

Vision loss affects over 2.2 billion people worldwide, with at least 1 billion cases preventable or untreated. Glaucoma is the leading cause of irreversible blindness globally (76 million affected). Diabetic retinopathy affects 103 million people and is the leading cause of blindness in working-age adults. AMD is the leading cause of blindness in those over 60. Cataract remains the leading cause of reversible blindness (95 million). Standardized clinical tools improve screening, treatment decisions, and patient outcomes.

When to Use

Use Glaucoma Risk to estimate conversion risk in ocular hypertension patients. Use DRSS for diabetic retinopathy screening and staging. Use AREDS AMD Risk for AMD patients to guide supplement decisions. Use Cataract Grading for standardized cataract documentation. Use VA Converter for interconversion between Snellen, LogMAR, ETDRS, and decimal notations.

Our ophthalmology calculators are developed in accordance with international guidelines including the AAO Preferred Practice Patterns, OHTS, AREDS, ETDRS, and WHO standards.

Available Ophthalmology Calculators

Clinical Guidelines

  • AAO Preferred Practice Pattern: Primary Open-Angle Glaucoma (2020)
  • AAO Preferred Practice Pattern: Diabetic Retinopathy (2019)
  • AAO Preferred Practice Pattern: Age-Related Macular Degeneration (2019)
  • AAO Preferred Practice Pattern: Cataract in the Adult Eye (2021)
  • WHO ICD-11 Classification of Visual Impairment (2018)
Enhance your ophthalmology practice with Tabeeb+ clinic management software. Document glaucoma risk, DR severity, AMD stage, cataract grade, and visual acuity in patient records.

Frequently Asked Questions

Type 1 diabetes: dilated examination within 5 years of diagnosis, then annually. Type 2 diabetes: dilated examination at diagnosis, then annually. If no retinopathy for 1-2 years, every 1-2 years. Moderate NPDR: every 6-12 months. Severe NPDR: every 3-4 months. PDR: every 3 months. Pregnant with diabetes: before conception, first trimester, then every 3-12 months during pregnancy.
In the US, legal blindness is defined as best-corrected visual acuity of 20/200 (decimal 0.1, LogMAR 1.0) or worse in the better-seeing eye, or a visual field of 20 degrees or less (tunnel vision). The WHO definition of blindness is 20/400 (decimal 0.05, LogMAR 1.3) or worse in the better eye. These definitions are used for disability benefits, driving restrictions, and blind registration.
Contraindications to cataract surgery include: (1) Unrealistic patient expectations or inability to cooperate with topical/local anesthesia. (2) Active ocular infection (blepharitis, conjunctivitis, keratitis, endophthalmitis). (3) Uncontrolled systemic conditions (recent MI, uncontrolled BP, poorly controlled diabetes with HbA1c >10). (4) Ocular surface disease that impairs biometry accuracy. (5) Active uveitis (wait until inflammation controlled for 3+ months). (6) Recent intravitreal anti-VEGF injection (avoid concurrent surgical eyes).
WHO ICD-11 classifies visual impairment as: Mild (20/40-20/60, Visual acuity worse than 6/12 to 6/18), Moderate (20/70-20/160, 6/24 to 6/60), Severe (20/200-20/400, 6/60 to 6/120), and Blindness (worse than 20/400, poorer than 6/120). Near vision impairment is defined as near visual acuity worse than N6 or M0.8 with existing correction.

Integrate these tools into your clinic workflow with Tabeeb+

Try Tabeeb+ for Your Clinic
Medical Disclaimer: This calculator is intended for use by healthcare professionals for educational and clinical decision support purposes only. It is not a substitute for professional clinical judgment.
Call Us
WhatsApp