What is a common characteristic of ocular migraines?
A) They typically involve visual disturbances, such as flashing lights or blind spots, without causing a headache.
B) They are always accompanied by severe, unilateral headaches without any visual symptoms.
C) They result in a gradual loss of vision over several days, with no associated symptoms.
D) They primarily cause nausea and vomiting with no visual or headache symptoms.