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What is Hypertropia and explain in detail?
Hypertropia is a condition of misalignment of the eyes (strabismus), whereby the visual axis of one eye is higher than the fellow fixating eye. 
Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye. 
Dissociated vertical deviation is a special type of hypertropia leading to slow upward drift of one or rarely both eyes, usually when the patient is inattentive.

Presentation
Associated defects
Refractive errors such as hyperopia and anisometropia may be associated abnormalities found in patients with vertical strabismus. 
The vertical miscoordination between the two eyes may lead to 

Strabismic amblyopia, (due to deprivation / suppression of the deviating eye)
cosmetic defect (most noticed by parents of a young child and in photographs)
Face turn, depending on presence of binocular vision in a particular gaze
diplopia or double vision - more seen in adults (maturity / plasticity of neural pathways) and suppression mechanisms of the brain in sorting out the images from the two eyes.
cyclotropia, a cyclotorsional deviation of the eyes (rotation around the visual axis), particularly when the root cause is an oblique muscle paresis causing the hypertropia.

Causes
Hypertropia may be either congenital or acquired, and misalignment is due to imbalance in extraocular muscle function