Astigmatism - What Is Astigmatism

Reference information: http://www.eye123.com.hk/

There are two types of astigmatism: regular and irregular. Irregular astigmatism is often caused by a corneal scar or scattering in the crystalline lens and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses. Regular astigmatism arising from either the cornea or crystalline lens can be corrected by a toric lens.

2. 散光 (Astigmatism)
散光即眼角膜弧度不規則，光線進入眼球後無法形成正確聚焦點，令影像模糊不清。散光多為遺傳，亦可能由後天因素形成，應定期諮詢眼科醫生作視力檢查。

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