Pinhole Glasses

The pinhole glasses are instruments used to detect the presence of amblyopia. If a student fails the refractive error test, then he or she has to screen for amblyopia. The pinhole glasses block light from coming through the outer part of the eye but contains tiny holes in the middle that directs light properly right onto the Retina. Pinhole glasses help reduce the effect of refractive errors, and acts as universal eyeglasses. If the student improves his or her reading after the pinhole test, then he or she has refractive error. However, students who fail to pass the pinhole test have amblyopia as their vision is not improved even with corrective glasses. (Amblyopia is a neural disorder, and not a physical) 

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