COVER TEST AND PRISM TESTS
An important part of the evaluation of a patient with squint is the cover test and prism tests. These tests are conducted in the office of the eye doctor itself. Using these tests the eye doctor is able to classify the type of the squint and to grade the severity of the same. This information is needed to plan the treatment including surgery where needed. With a torch light and a set of loose prisms the eye doctor is able to evaluate squint to a great degree.
Orthoptics is the study of how effectively the two eyes function together ( binocular vision). At Surya, this testing is done on many instruments including the synaptophore. Special instruments are used to measure the near point of convergence and near point of accommodation. These points give a guide as to how difficult it is for a person to view near objects. Many people with eyestrain on performing near work may be helped by excercises after the orthoptic evaluation.
HESS AND DIPLOPIA CHARTING
These two tests enable the measurement of misalignment between the two eyes. This type of problem leads to a condition of double vision in a patient. The extent of the double vision and the direction in which it is maximal can be charted by using these two tests. The tests are done using red and green goggles where in one colored glass is placed in front of one eye and the other in front of the other.