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Related Experiment Videos

Contrast sensitivity after epikeratophakia.

M J Mannis1, K Zadnik, C Johnson

  • 1Cornea and External Disease Service, University of California, Davis 95816.

Cornea
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Epikeratophakia surgery, used for aphakia correction, can degrade visual image quality. This study found reduced contrast sensitivity in patients after epikeratophakia, explaining subjective visual complaints.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Epikeratophakia is a surgical refractive correction for aphakia.
  • Patients may experience subjective visual degradation despite normal visual acuity post-surgery.

Observation:

  • Contrast sensitivity was evaluated in two patients with monocular aphakia corrected by epikeratophakia.
  • Measurements used computer-generated gratings and a wall chart system across spatial frequencies.
  • The epikeratophakia-corrected eye was compared to the fellow normal eye and the pre-operative contact lens-corrected eye.

Findings:

  • A significant depression in contrast sensitivity was observed at middle and high spatial frequencies in the epikeratophakia-treated eyes.
  • This reduction was evident when compared to the contralateral normal eye or the pre-operative contact lens-corrected eye with similar acuity.

Related Experiment Videos

  • One patient showed this contrast sensitivity deficit prospectively before and after surgery.

    • Implications:

    • The findings suggest that the epikeratophakia lenticule negatively impacts visual function beyond Snellen acuity.
    • Reduced contrast sensitivity may explain the subjective visual disturbances reported by patients post-epikeratophakia.
    • Further research into optimizing epikeratophakia outcomes is warranted to address these visual performance deficits.