History

20 year old healthy boy whose right eye was struck by a basketball  2  hours prior to presentation.

Ophthalmologic exam

Vision :Hand motion , with no afferent pupillary defect.
SLE :  Normal anterior segment;
           Eyelid  clean and conjunctiva white .
           Cornea :  clear, no edema or folds
           Anterior chamber :  deep and quiet, no cells
           Iris  : round and reactive 
           Lens : clear
Tension was 7 mm Hg in both eyes. Siedel  test negative.

Fundus exam:

Confluent areas of retinal whitening involving macula.  Retinal vessels pass undisturbed over these silver white patches. 

Differential Diagnosis

Retinal detachment
Branch retinal artery occlusion
White without pressure
Berlin's edema