H49.40

Clinical Causes: Genetic mutations affecting mitochondrial function Inherited mitochondrial disorders, such as Kearns-Sayre syndrome and some mitochondrial myopathies De novo genetic mutations without a family history Age-related degeneration of muscle tissues Secondary causes related to other neurological or muscular conditions Certain medication or toxin exposures that may impair muscle or nerve function

Key Symptoms: Gradual weakness of eye muscles leading to limited eye movements Drooping of the eyelids (ptosis) Difficulty tracking objects or moving the eyes in different directions Difficulty focusing and double vision (diplopia) Potential signs of associated neurological or muscular issues depending on underlying cause In some cases, the weakness remains confined to eye muscles, while in others it may involve additional muscles affecting facial expression or swallowing

Diagnosis Path: Detailed patient history focusing on symptom progression and family history Neurological and eye examinations to assess eye muscle strength and eye movement Electromyography (EMG) tests to evaluate muscle activity Magnetic Resonance Imaging (MRI) scans to rule out other neurological conditions Blood tests to identify mitochondrial dysfunction markers Genetic testing to detect mutations associated with mitochondrial diseases Muscle biopsy may be performed in certain cases to examine muscle tissue for characteristic changes

Treatment Protocols: Use of corrective lenses or prisms to reduce double vision Surgical options such as eyelid surgery (levator aponeurosis advancement) for severe drooping Eye muscle exercises and strengthening therapies in some cases Managing associated symptoms or underlying conditions Regular monitoring by ophthalmologists and neurologists to track disease progression Supportive therapies, including occupational therapy and counseling, to assist with daily activity management