Refraction error such as myopia, hypermetropia and astigmatism with a difference
significant diopters are now experienced by a small part of people. That refraction
error called anisometropia is caused by many things, such as predetermined at birth,
trauma, and even the failure of surgery refraction. On the patient's anisometropia,
refraction examination is done by using special Test FRIEND or a test Worth Four
Dot. The author uses descriptive method of data libraries, including the essay from
Troy E. Fannin, O.D. and Theodore Grosvenor, O.D., Ph.d., titled "Clinical Optics",
about the condition of uncorrected anisometropia who has a bi-okuler vision. Essay
from AK Khurana entitled "Theory And Practice Of Optics And Refraction" that is
about the range of treatments to patient’s anisometropia, so they can see in
binoculars vision comfortably.