Rigid gas permeable lens binding: significance and contributing factors | JoVE Visualize

Rigid gas permeable lens binding: significance and contributing factors

¹Cornea and Contact Lens Research Unit, School of Optometry, University of New South Wales, Kensington, Australia.

American Journal of Optometry and Physiological Optics|November 1, 1987

View abstract on PubMed

Summary

Rigid gas permeable lens binding occurred in 22% of overnight wear cases. Factors like large diameter, flat base curve, and poor fit increased binding incidence, often causing corneal staining.

Area of Science:

Ophthalmology
Optometry
Corneal Physiology

Background:

Rigid gas permeable (RGP) lenses are widely used for vision correction.
Lens binding, a complication of overnight RGP lens wear, can cause discomfort and visual disturbances.
Understanding the factors contributing to RGP lens binding is crucial for improving patient outcomes.

Purpose of the Study:

To retrospectively analyze the incidence and contributing factors of RGP lens binding during overnight wear.
To identify specific lens parameters, patient characteristics, and fitting factors associated with RGP lens binding.

Main Methods:

Retrospective analysis of 279 cases of overnight RGP lens wear.
Statistical analysis to correlate lens binding with lens design, fitting parameters, and patient factors.

Main Results:

An overall incidence of 22% for RGP lens binding was observed.
Lens binding was frequently associated with nasal positioning, spontaneous resolution within 1 hour, central corneal staining, and inferior conjunctival staining.
Corneal indentation rings were present in 53% of bound lens cases.
Binding occurred more frequently with large diameter lenses, flat base curves, minimal axial edge lift, 'on-K' or flat fittings, and suboptimal pre-closure lens movement.

Conclusions:

Overnight wear of RGP lenses is associated with a significant incidence of lens binding.
Specific lens design and fitting characteristics are strongly linked to an increased risk of RGP lens binding.
Optimizing lens parameters and fitting can potentially reduce the occurrence of overnight RGP lens binding.