This site provides general eye-health education. It cannot replace individual assessment by a registered doctor, and does not offer personal diagnosis, prescriptions, bookings, sales or referrals.
If translations differ or are incomplete, the Traditional Chinese (zh-Hant) text on this site prevails.
Explains the English abbreviations on a spectacle prescription. You may type the numbers from your paper — they stay on this screen and are not uploaded. This page does not sell glasses.
- Sph（球鏡）
- 近視用負號，遠視用正號。香港口語 100 度 = 1.00 D。
- Cyl（柱鏡）＋ Axis（軸）
- 散光的度數與方向（0–180°）。軸不是「斜視」。未矯正散光會令某一方向拉長模糊。
- Add（近用加度）
- 老花加在遠用處方之上，常見 +1.00 至 +2.75。兒童處方通常無 Add。
This tool only explains common English abbreviations on a written Rx. It cannot verify that your prescription is correct and is not a diagnosis or refraction advice. Numbers stay on this screen only and are not uploaded.
近視約 200 度
This tool only explains common English abbreviations on a written Rx. It cannot verify that your prescription is correct and is not a diagnosis or refraction advice. Numbers stay on this screen only and are not uploaded.
This tool only explains common English abbreviations on a written Rx. It cannot verify that your prescription is correct and is not a diagnosis or refraction advice. Numbers stay on this screen only and are not uploaded.
兒童常需散瞳驗光（睫狀肌麻痺），因為調節力強，不散瞳會低估遠視或漏咗隱性度數。成人驗光多數唔使散瞳，但眼底檢查往往要散瞳。
A demonstration is not an examination and cannot replace dilated fundus exam, visual field or OCT. A normal result here does not rule out disease. New changes need prompt review by a registered ophthalmologist; sudden vision loss — go to A&E. This site does not book or refer.