The nurse talks to a patient who reports eye pain, nausea, vomiting, and halos around lights. Which is the most important action for the nurse to take?

Acute angle-closure glaucoma is ophthalmic emergency due to sudden trabecular meshwork obstruction causing elevated intraocular pressure, optic nerve ischemia, presenting with severe ocular pain, nausea, vomiting, glaucoma, intraocular pressure, optic nerve, halos. Rationale: A. Cranial nerve III assessment evaluates ocular motor function involvement assessment. Cranial nerve III controls most extraocular eye movements functionally. Oculomotor dysfunction presents with ptosis diplopia not acute pain state. Symptoms here indicate intraocular pressure emergency not nerve palsy process. B. Acute angle-closure glaucoma is ophthalmic emergency from sudden trabecular blockage causing high intraocular pressure. acute angle-closure presents with severe eye pain, halos, nausea. emergency referral is required to prevent vision loss. Delay results in optic nerve ischemia and blindness state. C. Corneal light reflex assesses ocular alignment via cranial nerve II and III pathways. corneal reflex tests blink response to corneal stimulation touch. alignment abnormalities indicate strabismus not acute ocular pressure emergency. Symptoms require urgent referral not reflex testing process state. D. Presbyopia is age-related loss of lens accommodation due to decreased elasticity causing near vision difficulty. presbyopia develops gradually after age 40 years. age-related changes do not cause eye pain or halos. Symptoms here indicate acute pathology not refractive aging state.