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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
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
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
Astigmatism with TORIC IOLs
Explains astigmatism and how it is corrected with glasses and TORIC IOLS
Subhabrata Bhattacharya
Apr 13, 2023
Effective near add power for multifocal IOL based on patient axial length, Keratometry.
This calculator helps you to predict near add power in corneal or spectacle plane based on patient details and multifocal IOL add in lens
Subhabrata Bhattacharya
Feb 5, 2023
Understanding Defocus Curve of multifocal IOLs
defocus curve helps us to understand the peak near, intermediate vision that a multifocal IOl is capable of providing to patients
Subhabrata Bhattacharya
Jan 25, 2023
Calculating Optical Biometry Aconstant from contact/applanation ultrasound Aconstant
Converting contact ultrasound biometry aconstant to optical biometry aconstant
Subhabrata Bhattacharya
Jan 23, 2023
A constant Optimization Tool
This is an Aconstant optimization tool develped with the objective to make Aconstant optimization simple, yet effective. Please input 30 cas
Subhabrata Bhattacharya
Jan 21, 2023
Predicted post operative ACD calculator to match ELP
This calculator gives you an idea about post operative ACD or ELP by predicting it based on preoperatve ACD with optional lens thickness....
Subhabrata Bhattacharya
Jan 21, 2023
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