Ophthalmology Calculators & IOL Biometry
Ophthalmology is a highly quantitative specialty, relying on exact biometric measurements, refractive optical formulas, and rigorous staging criteria for vision-threatening diseases. The MedCalc Ophthalmology Hub provides comprehensive, 100% offline access to the algorithms necessary for high-volume eye clinics and ophthalmic surgery suites.
From executing advanced intraocular lens (IOL) calculations for post-refractive surgery patients to staging glaucoma severity and diabetic retinopathy, these zero-latency tools ensure precision at the slit lamp. All clinical scoring systems and biometry formulas are strictly aligned with guidelines from the American Academy of Ophthalmology (AAO) and the American Society of Cataract and Refractive Surgery (ASCRS).
Visual Acuity & Clinical Optics
👁️ VA LogMAR Calculator
Convert visual acuity measurements to LogMAR scale.
👁️ LogMAR to Snellen Converter
Converter between standard VA acuity scales.
👁️ Spherical Equivalent Calculator
Calculate spherical equivalent from astigmatic refraction.
👁️ Refraction SEQ Calculator
Determine exact spherical equivalent from autorefraction.
👁️ Vertex Distance Calculator
Convert lens prescription based on vertex distance.
👁️ BCVA WHO Classification
WHO visual impairment classifications based on acuity.
Cataract Surgery & IOL Biometry
👁️ Barrett Universal II Formula
Modern IOL power calculation formula.
👁️ Barrett Toric Calculator
Toric IOL power calculation and alignment tool.
👁️ Barrett True-K Formula
IOL calculation customized for post-refractive surgery eyes.
👁️ ASCRS Post-Refractive Tool
Alternative IOL tool for post-corneal refractive surgery.
Glaucoma & Tonometry
👁️ IOP Goldmann Corrector
Adjust intraocular pressure based on applanation tonometry.
👁️ IOP/CCT Correction Tool
Correct measured IOP based on central corneal thickness.
👁️ OHTS Risk Calculator
Ocular Hypertension Treatment Study glaucoma risk predictor.
👁️ Cup-Disc Ratio Assessment
Glaucoma progression assessment tool and staging.
👁️ Humphrey VF MD Interpreter
Interpret visual field mean deviation in glaucoma.
👁️ Hodapp-Parrish-Anderson Staging
Glaucoma visual field severity staging criteria.
Cornea, Ocular Surface & Refractive Surgery
👁️ OSDI Dry Eye Score
Ocular Surface Disease Index assessment for dry eye.
👁️ SPEED Questionnaire
Standard Patient Evaluation of Eye Dryness score.
👁️ Sicca Staining Score
Sjogren’s syndrome ocular surface staining score.
👁️ Belin ABCD Staging
Keratoconus progression staging based on tomography.
👁️ SIA Vector Calculator
Surgically Induced Astigmatism vector analysis tool.
Retina & Macular Disease
👁️ AREDS Severity Scale
Stage severity of age-related macular degeneration (AMD).
👁️ ETDRS Staging Tool
Stage diabetic retinopathy severity based on fundus findings.