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Related Experiment Videos

Diurnal visual changes in radial keratotomy: implications for visual standards. Refractive Surgery Study Group

M A Bullimore1, J E Sheedy, D Owen

  • 1School of Optometry, University of California, Berkeley.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1994
PubMed
Summary

Radial keratotomy (RK) patients experience diurnal vision shifts, potentially causing them to fail professional vision tests. Testing vision in both morning and afternoon is recommended for RK patients seeking employment.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Refractive Surgery

Background:

  • Diurnal variations in vision are documented in patients who have undergone radial keratotomy (RK).
  • This visual fluctuation can impact the ability of individuals to meet professional vision standards at different times of the day.

Purpose of the Study:

  • To investigate diurnal changes in visual acuity and contrast sensitivity in patients with a history of radial keratotomy.
  • To determine if these changes affect the ability to meet occupational vision standards.

Main Methods:

  • Compared 10 radial keratotomy (RK) patients and 9 controls over multiple morning and afternoon visits.
  • Measured visual acuity, refraction, keratometry, and contrast sensitivity under various conditions (natural/dilated pupils, glare).

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Main Results:

  • RK patients exhibited a significant myopic shift and corneal steepening from morning to afternoon.
  • Three RK subjects failed the firefighter visual acuity standard during afternoon testing.
  • RK patients showed reduced contrast sensitivity with dilated pupils, especially with glare.

Conclusions:

  • Existing visual standards for professions should incorporate testing in both morning and afternoon for RK patients.
  • Clinicians and employers should recognize that contrast sensitivity can decrease in low light conditions for RK patients.