当前位置： SCI文献检索 > JOURNAL OF CATARACT AND REFRACTIVE SURGERY期刊下所有文献 > Three-dimensional representation and qualitative comparisons of the amount of tissue ablation to treat mixed and compound astigmatism.

Three-dimensional representation and qualitative comparisons of the amount of tissue ablation to treat mixed and compound astigmatism.

Abstract：

PURPOSE:To compare the shape and volume of the lenticules of corneal tissue ablated for the correction of spherical, cylindrical, and spherocylindrical refractive errors using Boolean operations of theoretical 3-dimensional (3-D) surfaces. SETTING:Department of Ophthalmology, Rothschild Foundation, Paris, France. METHODS:Digital modeling software was used to perform graphic representations of ablated lenticules on 3-D virtual surfaces. Various Boolean operations were performed between different preoperative and postoperative surfaces, and the additional and subtractive properties of ablated theoretical lenticules were analyzed to determine profiles of ablated lenticules for mixed and compound myopic and hyperopic astigmatism. RESULTS:Negative-cylindrical treatment, used to treat simple myopic astigmatism, was equivalent to the combination of a positive-cylindrical and a negative-spherical treatment of the same magnitude. Combining a pure negative-cylindrical and a positive-spherical treatment in a sequential strategy when treating compound astigmatism resulted in redundant ablation (plano lenticule), leading to an unnecessary increase in the amount of tissue ablation. CONCLUSIONS:Negative-cylindrical treatments result in greater tissue ablation than corresponding positive-cylindrical treatments. For any given compound astigmatic error, the strategy using the greater magnitude of positive cylinder incurs the minimal amount of tissue ablation.

journal_name

J Cataract Refract Surg

journal_title

Journal of cataract and refractive surgery

authors

Gatinel D,Hoang-Xuan T,Azar DT

doi

10.1016/s0886-3350(02)01379-2

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

2026-34

issue

11

eissn

0886-3350

issn

1873-4502

pii

S0886335002013792

journal_volume

28

pub_type

杂志文章

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