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Subha's Ophthalmic Page
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search information related to IOL, biometry, corneal topography, etc.
Classification of monofocal, enhanced, and EDOF IOLs based on performance on defocus curve
Adapted from the JCRS https://doi.org/10.1097/j.jcrs.0000000000001502
Subhabrata Bhattacharya
Dec 15, 2024
Biometry case study-Selecting right patient for multifocal IOLs
A case study detailing how to avoid a bad outcome by looking into the IOL calculation or biometry page throughly
Subhabrata Bhattacharya
Dec 8, 2024
How patient axial length, corneal power and effective lens position affect the add power of a multifocal lens
Recently, Filomena and co-authors ( https://doi.org/10.1097/j.jcrs.0000000000001502 ) presented evidence based scientific classification...
Subhabrata Bhattacharya
Nov 27, 2024
Understanding spiral optics designed depth of focus IOLs
Recently a lot of interest has been generated on the concept of spiral optics and multifocal IOLs and contact lenses.
Subhabrata Bhattacharya
Sep 16, 2024
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 Barrett Universal II is an unpublished...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
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