<unk>  may occur due to mechanical eyelid abnormalities or neuro-paralytic corneal anesthesia. It may occur secondary to ocular surgeries like blepharoplasty, ptosis surgery etc. also. Lagophthalmos Lagophthalmos, the inability to close the eyelids completely is the main cause of<unk> . Common cause of lagophthalmos is facial nerve (CN VII) palsy. Facial nerve function may affect in several conditions like cerebrovascular accident, head trauma, brain tumors, Bell's palsy etc. Physiological inability to close the eyelids during sleep (nocturnal lagophthalmos) may also cause<unk> . Mechanical causes Chemical or thermal burns to eyelids or conjunctiva, ocular cicatricial pemphigoid, or symblepharon may cause incomplete or inadequate eyelid closure. Exophthalmos Exophthalmos is the unilateral or bilateral bulging of the eye anteriorly out of the orbit causing increased<unk>  of cornea. It may be seen in many conditions like Graves' ophthalmopathy, Orbital cellulitis, Orbital pseudotumor etc. Surgical A weak bell phenomenon may result in<unk>  after ptosis surgery. Postoperative lagophthalmos following blepharoplasty is another common cause of secondary<unk> .
Exposure keratopathy
Band keratopathy
Pitted keratolysis
Lattice corneal dystrophy
Bullous keratopathy
Granular corneal dystrophy
Macular corneal dystrophy
Neurotrophic keratitis