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search information related to IOL, biometry, corneal topography, etc.


A Beginner's Guide to the Optics of Intra Ocular Lens for Eye Care Professionals
Understanding the basics of optics is essential for eye care professionals because it enables them to accurately diagnose and manage...
Subhabrata Bhattacharya
Jul 6, 202519 min read


Complete Guide to IOL Power Calculation - Advanced Masterclass
The topics discussed in Masterclass are at an advanced level !! If you have not covered the basics, you are requested to first go through the Biometry section in this website, before you take the course. For complete understanding you can reach out for a tailor made course for your team Section 1- Understanding Modern Formula Architecture . Why different formulas behave differently What do we mean by vergence? Fig 1 Vergence describes how “converging” or “diverging” a bund
Subhabrata Bhattacharya
30 minutes ago8 min read


Understanding the Mechanics of Modern EDOF IOL Optics for Enhanced Depth of Focus
This video explains how modern IOLs including EDOF IOLs work to provide depth of focus and intermediate vision to patients. It also explains how to interpret the defocus curve or how to generate a defocus curve for such patients.
Subhabrata Bhattacharya
Feb 100 min read
About quickguide.org
Quickguide.org is an informal educational resource specifically for eye care professionals focusing on biometry, intraocular lens (IOL) power calculation, and advanced optics. Educational Value and Content This site offers deep technical insights into cataract surgery preparation. Its educational strengths include: Complex Concepts Simplified : It provides "guides" on advanced optics, such as spherical aberration , diffractive orders in multifocal lenses, and Zernike p
Subhabrata Bhattacharya
Jan 132 min read


Understanding Refractive Surprise with Multifocal IOLs
The Challenge of Multifocal IOLs Patients with multifocal IOLs expect to be free from glasses for distance, intermediate, and near vision. However, refractive surprises can occur, leading some patients to still require glasses. In my earlier article, "The Mystery of the Near with Presbyopia Correction IOL" ( link ), I discussed how factors like corneal shape and axial length can affect near vision. In this article, I will explain how a refractive surprise or incorrect refract
Subhabrata Bhattacharya
Nov 21, 20253 min read


Understanding Toric IOL Power Distribution in Intraocular Lens Optics
Explains how the Toric IOL nomenclature works and how the IOL power is distributed in the IOL optics for a spherical equivalent IOL power of 10 diopters and a Toric model of T4 or T5
Subhabrata Bhattacharya
Oct 22, 20251 min read


A Brief explanation of modern IOL power calculation formulas
This article provides insights into the different modern IOL power calculation formulas like the Barrett Universal, Kane and EVO formula
Subhabrata Bhattacharya
Sep 4, 202510 min read


Choice of EDOF according to individual patients spherical aberration values
The following table will help in the choice of EDOF IOL based on spherical aberration of the cornea of the patient and the induced spherical aberration by the IOL
Subhabrata Bhattacharya
Aug 17, 20251 min read


EDOF versus Monofocal Options: Navigating the Choice of IOL for Cataract Surgery
Cataract surgery is one of the most common procedures performed worldwide, helping millions regain clear vision each year. For patients, choosing the right Intraocular Lens (IOL) is a significant decision during this process. The two primary types are Extended Depth of Focus (EDOF) lenses and Monofocal lenses. Understanding the differences between these options can empower patients to make informed choices that fit their lifestyles and vision needs.
Subhabrata Bhattacharya
Jun 8, 20254 min read


Positive or negative spherical aberration- Which of the two provides better depth of focus by EDOF IOLs?
This article provides an understanding of circle of least confusion or best focus in presence of spherical aberration and what kind of spherical aberration may provide a better depth of focus
Subhabrata Bhattacharya
Jun 4, 20258 min read


Relation between the mesopic pupil size and diffractive zone of multifocal IOL
finding the cut off value for mesopic pupil size may be important for clinicians to ensure that patients have a good distance vision even in low light
Subhabrata Bhattacharya
May 17, 20256 min read


How does the PanOptix Pro reduce light scatter and improves light utilization?
How does the Panoptix Pro utilize more light and reduce light scatter.
Subhabrata Bhattacharya
May 2, 20257 min read
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