How do you do the Titmus fly test?
This is a test which the optometrist uses (normally with children) to detect stereopsis (the ability to perceive depth) and therefore identify conditions where stereopsis is absent eg amblyopia. The optometrist asks the person to put on a pair of specially tinted glasses through which a picture can be seen.
What is a stereo fly test?
The Stereo Fly Tests provide an easily administered check of stereoscopic depth perception at any age level. Its purpose is to measure how minutely the two eyes can discern differences in the distances of objects from the observer. Other depth determinants such as size, overlapping, perspective, etc.
How do you perform a stereopsis test?
Stereopsis is calculated by taking the least difference in seconds of arc that the individual can perceive binocularly. This value changes as the object’s distance from the eyes changes. Stereopsis improves at as distance from the eyes decreases.
How does the Randot stereo test work?
The Randot family of tests uses polarised vectographs to present different images to each eye. As humans are not sensitive to the polarisation of light, both images appear the same apart from the disparity.
What is the purpose of the Titmus stereo test?
Titmus Stereo Test. The Titmus stereo test consists of a combination of contour targets. The most common targets are a series of rings for older patients, animals for children, and a large stereo fly that is used mainly for screening. The circles test from 800 down to 40 seconds of arc while the animals test 400 to 100 seconds of arc.
How do you do a stereo fly test?
Have the patient try to “pinch” the tip of a wing between the thumb and forefinger. Note whether the fingers remain above the plane of the picture. Wiggling or moving the picture back and forth may assist some whose stereoscopic appreciation is sluggish. Use the “L” in the square and the “R” in the circle to check suppression. STEREOTEST – CIRCLES
Which is the best Test to test for stereopsis?
The Worth Four Dot test can also be used to evaluate binocular vision. The stereopsis grade of binocular vision is assessed by various charts, including the titmus fly test and the random dot stereo acuity chart .
Which is the best test for random dot stereo?
The Random Dot Stereo Test ( Fig. 17.3) consists of three subtests, with two tests using line stereo- grams and one using RDS. It also requires the use of polarized filters. The randot forms subtest is a pure RDS test with two disparity levels, 500 and 250 seconds.