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Related Experiment Video

Updated: Jun 27, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Higher-order aberrations induced by nuclear cataract.

Jooeun Lee¹, Myoung Joon Kim, Hungwon Tchah

¹Department of Ophthalmology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea.

Journal of Cataract and Refractive Surgery

|November 26, 2008

Summary

This summary is machine-generated.

Higher-order aberrations (HOAs) in nuclear cataract patients primarily originate from the lens, with coma being the main type. Cataract grade inversely correlates with spherical aberration, potentially explaining visual disturbances.

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Area of Science:

Ophthalmology
Optics
Vision Science

Background:

Nuclear cataract significantly impacts visual quality by altering ocular optics.
Understanding higher-order aberrations (HOAs) is crucial for diagnosing and managing visual dysfunction in cataract patients.

Purpose of the Study:

To quantify HOAs in the entire eye and specifically within the internal optics (lens) of patients diagnosed with nuclear cataract.
To identify the primary type of HOA and its correlation with cataract severity.

Main Methods:

Wavefront aberrations were measured using a visual function analyzer combining ray-tracing aberrometry and corneal topography.
The study included 33 eyes from 20 patients with nuclear cataract, analyzing an optical zone of 6.5 mm.

Main Results:

Wavefront maps of the entire eye closely resembled those of the internal optics.
The average root mean square (RMS) of HOAs was 1.59 µm for the entire eye and 2.13 µm for the internal optics.
Coma was the predominant HOA (mean RMS 0.98 µm entire eye, 1.28 µm internal optics), and spherical aberration correlated negatively with nuclear cataract grade (r=-0.450, P=.009).

Conclusions:

The majority of HOAs in nuclear cataract are attributable to the lens, with coma being the most significant aberration.
A negative correlation exists between nuclear cataract grade and spherical aberration.
These findings provide insights into the optical basis of subjective visual symptoms experienced by patients with nuclear cataract.