Those with corrected vision in the 0.2 to 0.01 range are said to have "weak" vision. Those with corrected vision of below 0.01 are legally blind. People with weak vision can see, and thus read, with the aid of prescription glasses or magnifying glasses.
視障有程度的差別，凡矯正後的優眼視力在○．二到○．○一之間，是所謂的「弱視」；優眼視力在○．○一以下者，則是所謂的「盲」。