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Visual function before and after photorefractive keratectomy for myopia

G Ambrosio1, G Cennamo, R De Marco

  • 1Università degli Studi di Napoli--Federico II, Facoltà di Medicina e Chirurgia, Istituto di Oftalmologia, Italy.

Journal of Refractive and Corneal Surgery
|March 1, 1994
PubMed
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Photorefractive keratectomy temporarily impacts contrast vision, especially at intermediate frequencies, though it recovers over six months. Glare sensitivity remains unaffected by this refractive surgery.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Visual Science

Background:

  • Traditional evaluation of photorefractive keratectomy relies on visual acuity and refraction.
  • Contrast sensitivity and glare perception are crucial for visual performance but often overlooked post-surgery.

Purpose of the Study:

  • To assess the impact of photorefractive keratectomy on contrast sensitivity function and glare sensitivity.
  • To investigate visual performance beyond standard metrics after refractive surgery.

Main Methods:

  • Prospective evaluation of 22 myopic eyes undergoing photorefractive keratectomy.
  • Measurement of static and dynamic contrast sensitivity and glare sensitivity preoperatively and at 1, 3, and 6 months postoperatively.
  • Eyes categorized into three groups based on myopia severity (-4.00 to -20.00 D).

Related Experiment Videos

Main Results:

  • Contrast sensitivity function (static and dynamic) at intermediate spatial frequencies was reduced at 1 month post-surgery.
  • A trend toward recovery of contrast sensitivity was observed at 3 and 6 months.
  • Glare sensitivity showed no significant changes after photorefractive keratectomy.

Conclusions:

  • Contrast sensitivity and glare testing can reveal visual function changes not detected by standard visual acuity.
  • These advanced visual tests are vital for evaluating refractive surgery outcomes, particularly for newer procedures.
  • Suboptimal contrast vision may persist despite good refractive results, highlighting the need for comprehensive visual assessment.