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The etiology of refractive changes at high altitude after radial keratotomy. Hypoxia versus hypobaria.
- Source :
-
Ophthalmology [Ophthalmology] 1998 Feb; Vol. 105 (2), pp. 282-6. - Publication Year :
- 1998
-
Abstract
- Objective: Refractive changes at high altitude that occur after radial keratotomy (RK) may be caused by hypoxia or hypobaria.<br />Design: A prospective study was performed to evaluate the effects of hypoxia on RK and non-RK corneas.<br />Participants: There were 20 RK and 20 control eyes.<br />Intervention: These eyes were subjected to ocular surface hypoxia using an air-tight goggle system at sea level for 2 hours.<br />Main Outcome Measures: Keratometry, cycloplegic refraction, and pachymetry were evaluated using repeated measures analysis of variance.<br />Results: A significant hyperopic shift (P < 0.0001) and corneal flattening (P < 0.0013) occurred in all subjects with RK compared with those of control subjects. Corneal thickening occurred symmetrically in both groups.<br />Conclusions: These results suggest that refractive changes in subjects with RK occur at high altitude as a direct result of corneal hypoxia.
Details
- Language :
- English
- ISSN :
- 0161-6420
- Volume :
- 105
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Ophthalmology
- Publication Type :
- Academic Journal
- Accession number :
- 9479288
- Full Text :
- https://doi.org/10.1016/s0161-6420(98)93094-9