However, an underlying cause of diplopia is not always found.
It usually does not result in symptomatic diplopia, as the child's developing brain suppresses the second image.
This means that A is seen simultaneously at two different places, a phenomenon called physiological diplopia, and this in fact does happen, as can be seen by fixing one's gaze on a distant point and holding a pencil fairly close to the face; with a little practice the two images of the pencil can be distinguished.
Many cases of diplopia resolve on their own and require only temporary patching of one eye to eliminate the offending second image.
Monocular diplopia is due to abnormalities in the structure of the eyeball itself, most notably the lens and cornea.
Monocular diplopia differs from binocular diplopia in that the double vision remains present when the nonaffected eye is covered.
Double vision, also called diplopia, perceiving of two images of a single object.
Causes of binocular diplopia include myasthenia gravis, inflammatory processes, thyroid eye disease (Graves ophthalmopathy), small blood vessel disease (e.g., diabetes mellitus), trauma, infections, and various tumours.
People with permanent diplopia may benefit from prisms placed in eyeglasses or from surgical realignment of the eyes.
If this occurs, the images of the two eyes, which are normally fused, may separate and give rise to double vision (diplopia).
Binocular diplopia occurs when the eyes are not properly aligned, and the image of an object that projects onto one retina does not fall spatially to the matching point on the other retina.
