The primary form of hearing loss in<unk>  is conductive hearing loss (CHL) whereby sounds reach the ear drum but are incompletely transferred via the ossicular chain in the middle ear, and thus partly fail to reach the inner ear (cochlea). This can affect one ear or both ears. On audiometry, the hearing loss is characteristically low-frequency, with higher frequencies being affected later. Sensorineural hearing loss (SNHL) has also been noted in patients with<unk> ; this is usually a high-frequency loss, and usually manifests late in the disease. The causal link between<unk>  and SNHL remains controversial. Over the past century, leading otologists and neurotologic researchers have argued whether the finding of SNHL late in the course of<unk>  is due to<unk>  or simply to typical presbycusis. Most patients with<unk>  notice tinnitus (head noise) to some degree. The amount of tinnitus is not necessarily related to the degree or type of hearing impairment. Tinnitus develops due to irritation of the delicate nerve endings in the inner ear. Since the nerve carries sound, this irritation is manifested as ringing, roaring or buzzing. It is usually worse when the patient is fatigued, nervous or in a quiet environment.
Otosclerosis
Band keratopathy
Corneal ulcer
Macular corneal dystrophy
Granular corneal dystrophy
Exposure keratopathy
Fundic gland polyposis
Bullous keratopathy