Development of the crystalline lens and congenital abnormalities affecting lens formation.

Core biochemical and physiologic principles underlying lens transparency and cataract formation.

Review of lens anatomy and clinically relevant structural concepts important for cataract surgery.

Overview of cataract prevalence, risk factors, and the global impact of cataract-related vision loss.

Neuro-ophthalmic manifestations of systemic disease including autoimmune, infectious, metabolic, and neoplastic conditions affecting the visual system.

Recognition of non-organic visual loss and functional neurologic presentations.

Differential diagnosis of pain syndromes including headache, neuralgia, and orbital disease.

Evaluation of ptosis, lid retraction, and facial nerve dysfunction.

Approach to anisocoria and pupillary defects including afferent and efferent pathway disorders.

Classification and evaluation of nystagmus and abnormal eye movement patterns.