Score

Visual Acuity

(ETDRS letter score/Snellen)

Visual Field Diameter (˚)

Elipsoid Zone Width (˚)

Mf ERG

Detectable P1 wave (>100 µv)

0

≥85 (20/20)

≥120

≥30

5 rings

1

<85 (20/20) to ≥80 (20/25)

<120 to ≥80

<30 to ≥15

4 rings

2

<80 (20/25) to ≥75 (20/32)

<80 to ≥40

<15 to ≥10

3 rings

3

<75 (20/32) to ≥70 (20/40)

<40 to ≥20

<10 to ≥7

2 rings

4

<70 (20/40) to ≥55 (20/100)

<20 to ≥15

<7 to ≥5

1 ring

5

<55 (20/100)

< 15

< 5

0 ring