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Related Experiment Video

Updated: Jul 9, 2026

Development of an In Vitro Ocular Platform to Test Contact Lenses
08:28

Development of an In Vitro Ocular Platform to Test Contact Lenses

Published on: April 6, 2016

Grading contact lens complications under time constraints.

Nathan Efron1, Sophia McCubbin

  • 1Institute of Health and Biomedical Innovation, and School of Optometry, Queensland University of Technology, Kelvin Grove, Australia. n.efron@qut.edu.au

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|December 20, 2007
PubMed
Summary
This summary is machine-generated.

Grading contact lens complications requires only a few seconds for most ocular pathologies. However, some complex conditions necessitate longer observation times for accurate assessment, impacting grading precision.

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Last Updated: Jul 9, 2026

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Area of Science:

  • Ophthalmology
  • Optometry
  • Contact Lens Technology

Background:

  • Contact lens wear is associated with various anterior eye pathologies.
  • Accurate grading of these complications is crucial for patient management.
  • The Efron Grading Scales provide a standardized method for assessing contact lens complications.

Purpose of the Study:

  • To determine the impact of observation time on the precision of grading contact lens complications.
  • To identify if specific ocular pathologies require different observation durations for accurate grading.

Main Methods:

  • Twenty-five optometry students utilized the Efron Grading Scales.
  • Students graded 16 distinct anterior eye pathologies depicted in images.
  • Grading was performed with varying observation times: 0.1, 2, and 60 seconds.

Main Results:

  • Longer observation times significantly improved grading precision (p < 0.004).
  • Specific complications demonstrated a need for extended viewing durations.
  • Mean grade was significantly influenced by image, observation time, and their interaction (p < 0.0001).

Conclusions:

  • Generally, brief viewing times (a few seconds) suffice for precise grading of most contact lens-related ocular complications.
  • Certain pathologies are more complex and demand longer observation periods for accurate grading.
  • Observation time is a critical factor influencing the reliability of contact lens complication assessment.