Corneal iron ring associated with orthokeratology lens wear
Corneal iron ring associated with orthokeratology lens wear
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DOI：
10.1097/00006324-200209000-00007
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发表时间：
2002-09-01
影响因子：
1.4
通讯作者：
Cheung, SW
中科院分区：
文献类型：
--
作者：
Cho, P;Chui, WS;Cheung, SW
一名有日戴软性角膜接触镜病史的27岁健康女性要求角膜塑形（ortho-k）治疗，并配戴了一副反向几何镜片。两周后，在两个角膜中观察到角膜表面下中周部分从4点延伸至8点的模糊边缘的微弱棕色色素弧。该患者无症状，对角膜矫正治疗的结果感到满意，地形图显示锐利且略微偏心的牛眼图案，表明双眼的角膜矫正效果在临床上可接受。环在双眼中延伸至接近完整的环，并且随着透镜继续磨损而变得更密集和更显著。这些环在外观上与圆锥角膜眼中的弗莱舍环相似，并且与地形图中观察到的牛眼边缘一致。患者继续无症状，裸眼视力为20/20（+1）（OD）和20/25（-1）（OS）。除了双侧存在铁环外，角膜完整性和地形图稳定且临床上无异常;允许患者继续配戴镜片，并计划每3个月进行一次定期的术后护理。铁环的形成可能的病因进行了讨论。
A healthy 27-year-old female with a history of daily wear soft contact lenses requested orthokeratology (ortho-k) treatment and was fitted with a pair of reverse geometry lenses. Two weeks later, a faint brown pigmented arc, with fuzzy margins, extending from four to eight o'clock at the inferior midperipheral part of the corneal surface was observed in both corneas. The patient was asymptomatic and happy with the results of the ortho-k treatment, and topographical maps showed a sharp and slightly decentered bull's eye pattern that indicated a clinically acceptable ortho-k effect for both eyes. The rings extended to a near-complete ring in both eyes and became denser and more significant as lens wear continued. The rings were similar in appearance to Fleischer's rings seen in keratoconic eyes and coincided with the margin of the bull's eye observed in the topographical maps. The patient continued to be asymptomatic with unaided visual acuity of 20/20(+1) (OD) and 20/25(-1) (OS). Apart from the presence of the iron rings bilaterally, the corneal integrity and topography were stable and clinically unremarkable; the patient was allowed to continue wearing the lenses with regular aftercare scheduled on a 3-month basis. Possible etiologies of the formation of iron rings are discussed.