Related Experiment Videos
Stray light in photorefractive keratectomy for myopia
H G Veraart1, T J van den Berg, R Hennekes
1Department of Ophthalmology, Free University of Brussels, Belgium.
Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1995
Summary
Photorefractive keratectomy (PRK) temporarily increases intraocular straylight, causing glare. While straylight typically returns to normal, significant increases persist in eyes with developing haze after PRK.
Area of Science:
- Ophthalmology
- Vision Science
- Surgical Technology
Background:
- Assessing visual function after refractive surgery is crucial.
- Intraocular straylight is a primary cause of glare, impacting visual quality.
- Photorefractive keratectomy (PRK) is a common surgical procedure for myopia correction.
Observation:
- The study evaluated intraocular straylight changes following PRK in four myopic eyes.
- A straylight meter utilizing direct compensation measured light scatter before and after surgery.
- The 5 mm ablation zone was used during PRK with a Summit laser.
Findings:
- A significant increase in intraocular straylight was observed within two weeks post-PRK.
- Straylight levels generally returned to preoperative baseline after the initial rise.
- Two eyes exhibited persistently elevated straylight, correlating with haze development (greater than grade two).
Implications:
- PRK can transiently affect visual function through increased straylight.
- Persistent straylight elevation may indicate complications like corneal haze.
- Monitoring straylight is important for understanding visual outcomes after PRK.