Worth 4 Dot app for iPhone and iPad

Designed for eye care professionals and students. Use at own discretion.

Use in place of Worth 4-Dot flashlight to assess for fusion, suppression and anomalous retinal correspondance.

Test with red-green anaglyphic glasses over best optical correction (red filter over right eye and green over left).

Patient should see one of the following:

* Two red dots: supression of left eye

* Three green dots: supression of right eye

* Four dots: normal binocular response

* Five dots:
a) Red dots on right
Uncrossed diplopia (esotropia)
b) Red dots on left
Crossed diplopia (exotropia)