Treatment of irregular astigmatism with a broad beam excimer laser

被引:0
作者
Buzard, KA
Fundingsland, BR
机构
[1] UNIV NEVADA,SCH MED,DEPT SURG,DIV OPHTHALMOL,LAS VEGAS,NV 89154
[2] UNIV NEVADA,SCH MED,BUZARD EYE INST,LAS VEGAS,NV 89154
[3] TULANE UNIV,SCH MED,DEPT SURG,DIV OPHTHALMOL,NEW ORLEANS,LA 70112
来源
JOURNAL OF REFRACTIVE SURGERY | 1997年 / 13卷 / 07期
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D O I
暂无
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
BACKGROUND: Four basic types of irregular astigmatism are described: central elevation, central dat area, eccentric elevation, and eccentric flat area. METHODS: The importance of the Munnerlyn formula is shown for the treatment of irregular astigmatism. A new diagnostic entity is described, the steep/flat ratio, modeled on the inferior/superior ratio described previously in keratoconus. Calculation of the steep/flat ratio is described using the cross sectional view of videokeratography, leading to specific treatments for the four-types of irregular astigmatism. Surgical technique using the VISX Star excimer laser for repeated laser in Situ keratomileusis (LASIK) is described. RESULTS: Case studies are given for each of the forms of irregular astigmatism showing improved topographic appearance and indicating treatment parameters. In each case, improvement of both uncorrected and spectacle-corrected visual acuity is demonstrated. CONCLUSIONS: Irregular astigmatism is an important complication of refractive surgery. Four basic forms of irregular astigmatism can be treated with a broad beam excimer laser.
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页码:624 / 636
页数:13
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