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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
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) IOL 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
Why we should stop asking about Abbe Number with Intra Ocular Lenses
This article describes what is Abbe number and chromatic aberration and answers if Abbe number is important for IOL industry
Subhabrata Bhattacharya
Jul 18, 2023
How to satisfy a patient who is having difficulty adjusting to astigmatism correcting glasses.
If a patient complains about his glass prescription and finds difficult to adjust to cylinder, how can you prescribe modify the prescription
Subhabrata Bhattacharya
Apr 16, 2023
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