4.9 What's your eyesight?

The visual acuity of 4.9 is the line 0.8 on the eye chart. This is two different calculation methods, which mean the same thing. Normal vision of the eye should be above 5.0, so if it shows vision loss, it is necessary to improve the relevant examinations as soon as possible to understand the specific causes of vision loss. Optometry can find out if there is refractive error; slit lamp examination can find out if there is eye surface disease or cataract; intraocular pressure examination can find out if there is glaucoma; fundus examination is mainly to find out if there is fundus disease. only when the specific cause is clear, can we know how to treat it.