Online IOL Calculators are special tools for calculating the optical power of an artificial lens. Other than routine spherical lens, they are most useful for Premium lenses like Multifocal and Toric lenses.

To calculate toric lenses, you must use specialized online resources from the manufacturer.

Below is a list of Toric calculators depending on the manufacturer of IOL:

LRI Calculator

Alcon calculator

Rayner calculator

Tecnis calculator

Zeiss calculator

Lentis calculator

General Toric IOL Calculator

Postoperative TORIC Lens Rotation Calculator

Calculation of Surgically Induced Astigmatism

Bausch Lomb calculator


Written by Dr. Dhaval Patel, MD (Ophthalmology, AIIMS New Delhi)

Consultant, Cataract & Refractive Surgery — first AIIMS-trained ophthalmologist practicing in Ahmedabad. Read full credentials & experience or view his 28 publications on ResearchGate.