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Shearing Strain

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...

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Study of the tear topography dynamics using a lateral shearing interferometer.

Alfredo Dubra, Carl Paterson, Christopher Dainty

|June 3, 2009

Summary

This study reveals dynamic tear film topography using lateral shearing interferometry. These tear dynamics impact vision, refractive surgery, and adaptive optics, offering potential for dry eye diagnosis.

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Area of Science:

Ophthalmology
Optometry
Biomedical Optics

Background:

The pre-corneal tear film is crucial for maintaining ocular surface health and visual function.
Understanding tear film dynamics is essential for diagnosing ocular surface diseases and optimizing ophthalmic interventions.

Purpose of the Study:

To investigate the dynamic topography of the pre-corneal tear film.
To explore the relationship between tear film dynamics and visual performance.
To assess the clinical potential of lateral shearing interferometry for ophthalmic applications.

Main Methods:

Utilized a purpose-built lateral shearing interferometer to study tear film topography in 21 subjects.
Recorded dynamic tear topography features, including post-blink undulation, break-up, and surface irregularities.
Calculated tear topography maps to analyze wavefront Root Mean Square (RMS).

Main Results:

Observed various dynamic tear topography features: post-blink undulation, break-up, eyelid-induced bumps/ridges, bubbles, and rough pre-contact lens tear surfaces.
Quantified the impact of tear dynamics on visual performance metrics (wavefront RMS).
Demonstrated the ability of lateral shearing interferometry to capture clinically relevant tear surface phenomena.

Conclusions:

Lateral shearing interferometry is a valuable tool for studying pre-corneal tear film dynamics.
Tear film topography significantly influences visual performance, refractive surgery outcomes, and ophthalmic adaptive optics.
The technique shows promise for clinical applications like dry eye diagnosis and contact lens evaluation.