Search research articles

Search research articles

Related Experiment Videos

A 'minimum-wear-and-tear' meshwork for the iris.

¹Schnurmacher Institute for Vision Research, State University of New York College of Optometry, 100 East 24th Street, 10010, New York, NY, USA. wyatt@sunyoptiedli

Vision Research

|July 6, 2000

Summary

This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Using high-density perimetry to explore new approaches for characterizing visual field defects.

Vision research·2023

Same author

Probing anterior segment kinetics with focally applied mydriatics.

Journal of ocular pharmacology and therapeutics : the official journal of the Association for Ocular Pharmacology and Therapeutics·2002

Same author

The role of target position in smooth pursuit deceleration and termination.

Vision research·2001

Same author

Detecting saccades with jerk.

Vision research·1998

Same author

Offset dynamics of human smooth pursuit eye movements: effects of target presence and subject attention.

Vision research·1997

Same author

Ocular pharmacokinetics and convectional flow: evidence from spatio-temporal analysis of mydriasis.

Journal of ocular pharmacology and therapeutics : the official journal of the Association for Ocular Pharmacology and Therapeutics·1996

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

The iris, composed of collagen, may be structured to minimize wear and tear during frequent pupil size changes. Its optimal meshwork and nonlinear stretching properties suggest a design for durability.

Area of Science:

Ophthalmology
Biomechanical Engineering
Materials Science

Background:

The iris, crucial for regulating light entry, undergoes significant dimensional changes due to pupil size fluctuations.
Its structural components, primarily collagen, are known for their low extensibility and long-term durability.
Understanding the iris's mechanical properties is key to explaining its longevity despite constant deformation.

Purpose of the Study:

To investigate the biomechanical principles underlying the iris's structural integrity.
To develop a theoretical model for an optimal iris meshwork that minimizes mechanical stress and wear.
To compare this theoretical model with actual iris behavior and available biological data.

Main Methods:

Development of a theoretical concept for a minimum-wear-and-tear meshwork based on iris geometry.

Related Experiment Videos

Derivation of an optimal form for this meshwork.

Mathematical modeling of iris deformation, incorporating nonlinear stretching properties.

Comparison of the derived optimal meshwork and stretch behavior with existing experimental data.

Main Results:

A theoretical optimal meshwork structure for the iris was derived.
Incorporating nonlinear stretching properties of the iris material moderately improved the performance of the theoretical model.
The derived optimal meshwork and predicted stretch behavior align with available biological data on iris structure and function.

Conclusions:

The iris's structure may be optimized to minimize mechanical wear and tear during pupil size changes.
The collagenous meshwork and nonlinear elastic properties of the iris contribute to its remarkable durability.
This study provides a biomechanical framework for understanding iris resilience.