Table 2.

Priority grading, SSN (National Health System) RAO classification.

Priority	Scheduling time	Clinical conditions	Symptoms
U	Within 72 h	Ocular trauma, conjunctivitis, keratitis, uveitis	Acute visual loss or scotoma, amaurosis, endophthalmitis, acute glaucoma, new onset anisocoria, ocular inflammations (orbital cellulitis), acute ptosis, foreign body, phosphenes and floaters, acute diplopia, new onset monolateral exophthalmos, chemical and thermal burns, metamorphopsia
B	Within 10 days	Eyelid inflammatory disease, eyelid and orbital tumors
D	Within 30 days	Glaucoma, diabetic retinopathy, chronic conjunctivitis, evaluation for starting/maintaining systemic therapies (e.g. hydroxychloroquine, corticosteroids, . . .)
P	Longer period	Long-time loss of vision, pterygium, new diagnosis of diabetes or hypertension, familiarity for glaucoma and others hereditary ocular diseases
			Rescheduled visits

U: urgent; B: less urgent; D: deferrable; P: programmable.