<unk>  causes some people to have mild vision problems, or occasionally more serious symptoms like alternating vision or frequent squinting. However, since most people do not show any clear symptoms, the condition usually is found during a routine eye exam. For early detection in preverbal children, photoscreening can be used. In this brief vision test specialized cameras detect each eye's light reflexes, which the equipment's software or a test administrator then interprets. If photoscreening indicates the presence of risk factors, an ophthalmologist can then diagnosis the condition after a complete eye exam, including dilating the pupils and measuring the focusing power of each eye.
Anisometropia
Hypertropia
Emmetropia
Cyclotropia
Physiological anisocoria
Exotropia
Ocular dysmetria
Heterotopia 