ROP

Question 1

Threshold disease

Answer 1

CRYO-ROP

• 5 contiguous OR 8 total clock hours of stage 3
• Zone II w plus OR Zone I

Question 2

Pre-threshold disease

Answer 2

ETROP

Type 1

• zone I w plus (any stage)
• zone I stage 3
• zone II, stage 2 or 3 w plus

Type 2

• zone I, stage 1 or 2 w/o plus
• zone II, stage 3 w/o plus