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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
How the Barrett Universal II formula works - impression from a user
The following video content is an impression of how the Barrett Universal II formula works. Barrett Universal II is an unpublished...
Subhabrata Bhattacharya
Jul 27, 2024
Calculator for deriving corneal power with true indices and radius of curvature of anterior and posterior cornea
This calculator will help you to calculate the power of cornea from the radius of curvature
Subhabrata Bhattacharya
Jul 25, 2024
Difference between labelled IOL power and actual power of the IOL
A common notion amongst clinicians is that the labelled power (diopter) on the IOL box is precisely the power of the IOL. That is, the...
Subhabrata Bhattacharya
Jul 3, 2024
Find : Diameter of central Bull's Eye of diffractive multifocal IOL and to which focal point this light is dedicated to
Objective: This tool helps you to find following things: What is the true size of the diameter of the central bull's eye of the...
Subhabrata Bhattacharya
May 21, 2024
Why present day IOL box A constant based on thin optics concept needs to be reworked to improve IOL power prediction with thick lens formulae
Objective of this article: In this article I am proposing a method that helps manufacturers as well as users adapt IOL box A constant to...
Subhabrata Bhattacharya
Apr 23, 2024
Calculation of IOL power and location of principal planes based on thick lens formula
This tool helps you to calculate the lens power based on thick lens formula. It also helps locate principal plane in the optic
Subhabrata Bhattacharya
Apr 16, 2024
Understanding Angle Alpha & Angle Kappa- the finer aspects
Optical axis of the eye is a theretical concept. Clinically, if a point source of light was projected to the eye, then all reflexes from the
Subhabrata Bhattacharya
Feb 24, 2024
Why some patients land up with unexpected spherical surprise after IOL implantation.
The refraction shown against target IOL Power in the biometry page is not emmetropia but a spherical equivalent.
Subhabrata Bhattacharya
Dec 28, 2023
Guide to Extended Depth of Focus (EDOF) IOLs optics.
At the end of the reading, you will get an understanding of the design of the Extended Depth of Focus (EDOF) IOLs in the market, and how the
Subhabrata Bhattacharya
Nov 12, 2023
Understanding the Point Spread Function and Strehl Ratio of a lens system
Point spread Function gives us an understanding of the resolution of an optical system.
Subhabrata Bhattacharya
Oct 4, 2023
Pin hole Test - Interpretation
Interpreting a pin hole test for vision testing.
Subhabrata Bhattacharya
Sep 21, 2023
Haigis L Formula for Post Lasik
This tool will help you to use Haigis L formula for post lasik patients. As first step it helps you to convert K readings.
Subhabrata Bhattacharya
Sep 4, 2023
Shammas post Lasik A-constant and Corneal reading conversion
This allows you to convert post Lasik corneal reading and IOL constant to Shammas post lasik formula with no history method
Subhabrata Bhattacharya
Aug 23, 2023
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