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Topographic predicted corneal acuity with intrastromal corneal ring segments
D K Holmes-Higgin1, T E Burris, P A Asbell
1Northwest Corneal Services and the Corneal Topography Reading Center, Portland, OR 97223, USA.
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|June 15, 1999
Summary
Intrastromal corneal ring segments (ICRS) did not significantly alter predicted corneal acuity. This refractive procedure maintained the cornea's optical quality, showing no induced topographic irregularities.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Optics
Background:
- Intrastromal corneal ring segments (ICRS) are used to correct myopia.
- Assessing the impact of ICRS on corneal optical quality is crucial for understanding refractive outcomes.
Purpose of the Study:
- To evaluate the predicted optical quality of the central anterior cornea before and after intrastromal corneal ring segment (ICRS) implantation.
- To assess if ICRS procedures induce topographic irregularities in the central cornea.
Main Methods:
- Predicted corneal acuity, a videokeratoscope-derived index, was measured preoperatively and at 3 months post-ICRS in 94 eyes.
- The index quantifies optical quality by comparing measured corneal shape to best-fit ellipses within the central 3 mm.
Main Results:
- Preoperatively, 98% of eyes had a predicted corneal acuity of 20/10.
- Three months post-ICRS, 51% achieved 20/20 or better, 96% achieved 20/40 or better, and 98% maintained 20/10 predicted acuity.
- Spectacle-corrected visual acuity for eyes with 20/10 predicted acuity ranged from 20/10 to 20/25.
Conclusions:
- Predicted corneal acuity remained stable post-ICRS, indicating no significant change from baseline.
- The ICRS procedure did not appear to induce detectable topographic irregularities in the central cornea.