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

Diffractive intraocular lens are designed to distribute incident light into multiple focal points, enabling functional vision across distances. In this context, light utilization—the percentage of incident directed into useful diffraction orders—has emerged as a commonly cited performance metric. Manufacturers often report efficiencies approaching 85–90%, implicitly suggesting that higher values correspond to superior optical performance. However, clinical experience and opti

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 refraction can result in good distance v

Understanding the basics of optics is essential for eye care professionals because it enables them to accurately diagnose and manage various visual problems. A solid foundation in optics helps professionals explain how light interacts with the eye, understand refractive errors such as myopia, hyperopia, astigmatism, and presbyopia, and determine appropriate corrective measures like glasses, contact lenses, or surgical options. Additionally, knowledge of optics allows for the

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

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

How does the Panoptix Pro utilize more light and reduce light scatter.

Reference: Holladay, Jack T. MD, MSEE; Kozhaya, Karim MD; Koch, Douglas D. MD; Wang, Li MD, PhD, Impact of spherical aberration on visual...

Explains how does the Tecnis PureSee IOL provide depth of focus and intermediate vision to patients.

standard way of diffractive trifocal IOL manufacturing has been to use the 0 order for distance, & the +1 & +2 orders intermediate & near

Since the launch of the RayOne Galaxy lens, there has been a significant amount of attention focused on spiral optics and how such design provides multiple focal points to provide depth of vision to patients. The adoption of spiral optics to provide such multifocality in IOLs or contact lenses is new, and not many literature is available that would help a layman like myself, to comprehend. So here I set out to reflect what I have understood whatever reading material is availa

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...

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

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

Point spread Function gives us an understanding of the resolution of an optical system.

Interpreting a pin hole test for vision testing.

This article describes what is Abbe number and chromatic aberration and answers if Abbe number is important for IOL industry

defocus curve helps us to understand the peak near, intermediate vision that a multifocal IOl is capable of providing to patients

A theoretical representation of what should be the ideal bull's eye (central optic) diameter of lens to be less susceptible to angle kappa.

The concept of freeform lens or digital lens or even order aspheric design