Publisher Summary This chapter discusses the clinical features of concomitant squint. A squint in childhood is often first recognized or suspected by the parents when one eye appears to drift inwards or outwards. Double vision is seldom appreciated by the young child because the image from the squinting eye is rapidly suppressed by the brain. This suppression interferes with the normal development of vision resulting in an amblyopic (lazy) eye. The appearance of a convergent squint in infants is often caused by broad epicanthic folds, but a true squint can be detected by (1) the inspection of the corneal reflexes with a torch light; these are normally symmetrical and (2) the cover test; if the eye fixating an object, such as a small toy, is covered, the squinting eye will move to take up fixation. The commonest form is latent divergence (exophoria) followed by latent convergence (esophoria) and less commonly vertical deviation. Any generalized debility or illness may lead to the decompensation of a latent squint resulting in a manifest squint. A latent squint that is controlled only with difficulty may cause eyestrain.