Timolol Psychiatric disorders: insomnia, nightmares, decreased libido Nervous system disorders: dizziness, memory loss, increase in signs and symptoms of myasthenia gravis, paresthaesia, cerebral ischaemia Eye disorders: decreased corneal sensitivity, diplopia, ptosis, choroidal detachment (following filtration surgery), refractive changes (due to withdrawal of miotic therapy in some cases), keratitis.