Interactive Assessment

Click and drag to explore zones

Practice Mode

Score

0

Streak

0

High Score

0

Challenge 1/5

Easy
Time Left:0s

Quick Reference:

  • • Zone I: Extends twice the disc-macula distance
  • • Zone II: From Zone I to nasal ora serrata
  • • Zone III: Remaining temporal crescent
  • • Grey dashed line: Marks posterior Zone II

Identify Zone I: This zone extends twice the disc-macula distance from the optic disc in all directions. It's the most critical zone for ROP treatment.

Click and drag to explore zones

Achievements

Zone Definition Guide

  • Zone I:

    Circle with radius of 2x distance from optic disc to macula

  • Posterior Zone II:

    Additional 2 disc diameters beyond Zone I

  • Zone II:

    From Zone I to nasal ora serrata

  • Zone III:

    Remaining temporal crescent

Case Studies

Case 1: Early Stage ROP

easy

Premature infant at 32 weeks PMA. Identify the zone of vascular termination.

Click and drag to explore zones

Select the zone:

If you"re "stuck" or need help, don't hesitate to use the tutorial!