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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
Cooke-modified axial length (CMAL)
How CMAL may be the answer to traditional optical biometry measuring axial length on the basis of group refractive index
Subhabrata Bhattacharya
Jul 3, 2021
The science behind Barrett Universal II formula
The below video will describe Barrett Universal II formula, its origin and the science behind it, including Lens Factor and the Gaussian...
Subhabrata Bhattacharya
Jun 25, 2021
Interpreting Zernike Polynomials in Ophthalmology
Below video explains the Zernike Polynomials from a Opthalmology point of view. You can also read the article explaining Zernike...
Subhabrata Bhattacharya
Jun 20, 2021
Science Behind Diffractive Multifocals
The author visiting Lighthouse (optics) in Kerala, India in 2018. There are very few people who would not stop by to see, if ever they...
Subhabrata Bhattacharya
Jun 14, 2021
Optical Biometry - Myth & Science
Optical biometry has added much value to refractive outcome, but there are some myths and misconceptions associated with optical biometry
Subhabrata Bhattacharya
Apr 14, 2021
Decoding Snellen Chart in 4 mins !
This explains the science behind the Snellen chart and why is it kept at a distance of 6m or 20f from the eye
Subhabrata Bhattacharya
Mar 3, 2021
Second Eye IOL Power calculator based on First Eye Prediction error
f you had a more than .50 diopter of refractive error in the first eye, here is a calculator to to consider IOL power for the second eye ba
Subhabrata Bhattacharya
Feb 10, 2021
A simple interpretation of Zernike Polynomials
This article explains how to interpret Zernike polynomials that is associated with aberrometry charts
Subhabrata Bhattacharya
Dec 17, 2020
A constant to Lens Factor (LF) conversion for Barrett
Here is Lens Factor to corresponding A constant for Barrett Universal II. Earlier in video presentation https://www.quickguide.org/post/...
Subhabrata Bhattacharya
Nov 25, 2020
Binocular Summation – Understanding Patient Candidacy for Multifocal IOLs
A key element in evaluating a patient for multifocal IOL candidacy should include determination of normal binocular vision.
Subhabrata Bhattacharya
Aug 19, 2020
Eye & Astigmatism - Part IV
https://www.youtube.com/watch?v=6U2tr2Lgwdo&t=42s
Subhabrata Bhattacharya
Jul 26, 2020
Eye & Astigmatism - Part III
https://www.youtube.com/watch?v=7c9xTsMVJFE&t=690s https://www.youtube.com/watch?v=7c9xTsMVJFE&t=690s
Subhabrata Bhattacharya
Jul 26, 2020
Eye & Astigmatism - Part II
https://www.youtube.com/watch?v=1FUUCmq9lAQ&t=221s
Subhabrata Bhattacharya
Jul 26, 2020
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