Table 9.

Logic of treatment recommendations for the fourth stage of the system.

	Surgery	Medication	Observation
Pterygium	Pupillary invasion (>1.5) or progressive stage or enlargement in the past 6 months	Congestion or bleeding in the head and body
Subconjunctival hemorrhage		Congestion or hemorrhage
Keratitis	Perforated phase or (quiet phase with corneal clouding) or ulcerated infiltrative phase >3 months	Ulcer infiltration or (quiet healing period, and <3 months) or photophobia and tearing	Quiet healing period and >3 months
Cataract	Cataract and (age >50 years or recent vision loss)
Cobalt blue light slit-lamp	Perforated or near perforated	Lamellar staining	No staining or punctate staining