Changes in Corneal Biometry and the Associated Histology in Rhesus Monkeys Wearing Orthokeratology Contact Lenses

被引:23
|
作者
Ding, Hui [1 ]
Pu, Aijun [1 ]
He, Hong [1 ]
Xie, Ruo Zhong [2 ]
Yang, Jun [1 ]
Liao, Aiping [1 ]
Gao, Shaohui [1 ]
Zhong, Xingwu [1 ]
机构
[1] Sun Yat Sen Univ, Zhongshan Ophthalm Ctr, State Key Lab Ophthalmol, Guangzhou 510060, Guangdong, Peoples R China
[2] Sydney Vis Care Res Ctr, Sydney, NSW, Australia
基金
中国国家自然科学基金;
关键词
orthokeratology; corneal curvature; epithelial cells; myopia; rhesus monkey; OVERNIGHT ORTHOKERATOLOGY; THICKNESS; MYOPIA;
D O I
10.1097/ICO.0b013e318254688a
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: This study compared the effect of orthokeratology (OK) lens wear on corneal topography and microstructure between the 1-night and 30-night wearers to predict any adverse responses of the eyes to long-term OK lens wear. Methods: Nine rhesus monkeys with one eye wearing an OK lens and the fellow eye wearing a rigid gas permeable (RGP) lens were used in this study. The lenses were worn for 11 hours, with the measurement of corneal curvature and thickness and axial components of the eye at 0 night (n = 9), 1 night (n = 9), and 30 nights (n = 6). Histology was performed at 1 and 30 nights of lens wear. Results: Corneal surface power in the 3-mm central region was reduced in the OK eye when compared with the RGP eye (P < 0.05). Central corneal thickness was only reduced in 30 nights of OK lens wear (P < 0.05). Under light microscopy, the 1-night OK or RGP eyes showed normal morphology in all layers of the cornea. The 30-night OK eyes showed a thinned central corneal epithelium and a thickened but less stratified paracentral corneal epithelium when compared with the 30-night RGP eyes. Under electron microscopy, intercellular junctions of corneal epithelium in the 30-night OK eyes were much looser than those in the 1-night OK eyes. However, the density and morphology of hemidesmosomes were similar between the OK and RGP eyes at 30 nights of lens wear. Conclusions: Overnight OK can change the corneal curvature through anterior corneal remodeling, resulting in an effective correction of myopia. However, a decrease in intercellular junctions during long-term wear may compromise the functions of the corneal epithelium as a border mechanical barrier.
引用
收藏
页码:926 / 933
页数:8
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