Table 3 EOU Score

Ease Of Use (EOU) Score

[1] Could not use at all

[2] Could not see the red reflex to even begin with

[3] Could identify red reflex

[4] Could see vessels but not disc

[5] Could identify disc but not vertical CD-ratio (VCDR)

[6] Could determine VCDR with a high level of difficulty

[7] Could determine VCDR with a medium level of difficulty

[8] Could determine VCDR with a low level of difficulty