The significance of checking pinhole vision is as follows:
Checking pinhole vision can detect whether there is a refractive error in your vision, and thus determine whether to wear glasses.
If the distance visual acuity is less than 1.0, a pinhole visual acuity test should be performed, that is, the subject is asked to pass a black film with a circular hole of up to 2mm, and then the visual acuity is checked. If the pinhole visual acuity is improved, it means that there is The presence of refractive errors indicates that poor vision is mostly caused by refractive errors, which usually require correction by wearing glasses. If pinhole vision does not improve, the poor vision is caused by an eye disease.
Extended information:
Notes
Pinhole vision can be used in both corrected and uncorrected conditions. It can distinguish poor vision. Whether due to refractive error. Pinhole vision is measured primarily when looking at distance.
Uses of pinhole eyes:
People with a vision of 0.1 can improve their vision ten times by wearing pinhole glasses. Since it is purely a physical method, these glasses have no side effects and have been used Patented in Japan, it is not only suitable for students who are prone to myopia, but also for people whose eye muscle vitality decreases with age.
Reference source: Baidu Encyclopedia-Vision