Alternate Cover Test

B the prism alternate cover test.

Alternate cover test. All can be performed with fixation at distance or near. The alternating cover test. Unilateral cover test also called the cover uncover test is the test that determines if the patient has a phoria or a tropia. A cover test or cover uncover test is an objective determination of the presence and amount of ocular deviation.

The objective cover test can be divided into the unilateral cover test and the alternate cover test. It is typically performed by orthoptists ophthalmologists and optometrists during eye examinations. Both eyes move each time the cover alternates from 1 eye to the other. This procedure causes breakdown of the binocular fusion mechanism and will reveal refixation movements of each eye at the moment of uncovering.

The monocular cover uncover test is the most important test for detecting the presence of manifest strabismus and for differentiating a heterophoria from a heterotropia fig 6 1. Cover test should always be done in good illumination. There are 3 types of cover tests. The unilateral cover test or the cover uncover test.

The cover uncover test the alternate cover test and the simultaneous prism and cover test. The eyes do not move as the cover alternates from 1 eye to the other. When performing the alternate cover test it is important to hold the occlude over each eye for at least a few seconds in order to allow the non occluded eye enough time to pick up fixation. Exotropia left eye fixating.

The two primary types of cover tests are. In the alternate cover test the eyes are rapidly and alternately occluded from one eye to the other and then back again. Testing for the covid 19 coronavirus can be an unpleasant affair with a doctor or nurse shoving a cotton swab deep into your nasal cavity to get a good sample. The exotropia is neutralized with a prism of the correct power.