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Related Experiment Video

Updated: Aug 15, 2025

Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Published on: February 23, 2018

Accommodation through simulated multifocal optics.

Shrilekha Vedhakrishnan¹, Alberto de Castro¹, Maria Vinas²

¹Instituto de Optica "Daza de Valdes", Consejo Superior de Investigaciones Cientificas, IO-CSIC, Serrano, 121, Madrid 28006, Spain.

Biomedical Optics Express

|January 2, 2023

Summary

This summary is machine-generated.

Multifocal contact lenses and positive spherical aberration can enhance the eye's accommodative response. This research shows specific designs lead to a steeper shift in spherical aberration and reduced accommodative lag during visual tasks.

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Area of Science:

Ophthalmology
Optometry
Visual Optics

Background:

Understanding the interaction between multifocal contact lens designs and the eye's accommodation is crucial for correcting presbyopia.
Spherical aberration (SA) plays a significant role in visual quality and accommodative function.

Purpose of the Study:

To evaluate how different multifocal contact lens patterns and spherical aberration levels affect the accommodative response.
To investigate the relationship between accommodative demand, spherical aberration changes, and accommodative lag.

Main Methods:

Utilized an adaptive optics visual simulator projecting seven patterns simulating various contact lens designs (e.g., Bifocal Center Distance, Multifocal Center Near) and spherical aberration levels (±1µm).
Employed Hartmann-Shack measurements to quantify changes in spherical aberration and the accommodative response to specific visual demands.

Main Results:

Positive spherical aberration and Center Distance multifocal designs were associated with a significantly higher accommodative response (p=0.001 and p=0.003, respectively).
These conditions induced a steeper shift of spherical aberration towards negative values and resulted in lower accommodative lag, indicating more effective focusing.

Conclusions:

Multifocal contact lens designs, particularly those with a Center Distance configuration, can modulate the eye's accommodative behavior.
Positive spherical aberration appears to facilitate a more robust accommodative response, potentially improving visual function in presbyopic individuals.