<unk>  is best detected by examining the sclera in daylight; retracting the lids helps determine the extent of involvement. Other aspects of the eye exam (i.e. visual acuity testing, slit lamp examination, etc.) may be normal.<unk>  may be differentiated from episcleritis by using phenylephrine or neosynephrine eye drops, which causes blanching of the blood vessels in episcleritis, but not in<unk> . Ancillary tests CT scans, MRIs, and ultrasonographies can be helpful, but do not replace the physical examination. Classification<unk>  can be classified as anterior<unk>  and posterior<unk> . Anterior<unk>  is the most common variety, accounting for about 98% of the cases. It is of two types : Non-necrotising and necrotising. Non-necrotising<unk>  is the most common, and is further classified into diffuse and nodular type based on morphology. Necrotising<unk>  accounts for 13% of the cases. It can occur with or without inflammation.
Scleritis
Episcleritis
Periostitis
Corneal hydrops
Corneal neovascularization
Interstitial keratitis
Otosclerosis
Vasculitis