کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9075379 | 1143911 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The biomechanics of rigid contact lens removal
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کلمات کلیدی
موضوعات مرتبط
علوم پزشکی و سلامت
پزشکی و دندانپزشکی
چشم پزشکی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The removal of rigid contact lenses from the eye, using the eyelids, is a relatively simple procedure. However, there is a sequence of biomechanical events underlying this procedure which are not well understood. By using high-speed videokeratoscopy (50 Hz), we have shown that during the lid-pull procedure the cornea typically shows a significant increase in with-the-rule astigmatism by an average of 2.19 D (axial power). The average increase in steep K power was 1.22 D (S.D. ±1.05 D) and the average decrease in flat K power was 0.97 D (S.D. ±1.05 D). This change in corneal topography increases the edge lift of the lens at 12 and 6 O'clock locations of the lens, enhancing the removal process. When the subject blinks, as the lid margins reach the lens edge, the lens flexes and the eye retracts by an average of 0.66 mm (S.D. ±0.27 mm). This retraction again enhances the act of lens removal.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Contact Lens and Anterior Eye - Volume 28, Issue 3, September 2005, Pages 121-125
Journal: Contact Lens and Anterior Eye - Volume 28, Issue 3, September 2005, Pages 121-125
نویسندگان
Michael J. Collins, Stephanie C. Voetz, Nora Bretschneider,