Surgery For Exotropia: 15-35 Δ (Two Muscles*)

(from William E. Scott)

Angle BLRc LRc MRs
15 4 mm or→ 4 mm 3 mm
20 5 mm or→ 5 mm 4 mm
25 6 mm or→ 6 mm 5 mm
30 7 mm or→ 7 mm 6 mm
35 8 mm or→ 8 mm 6 mm

Surgery for Exotropia: 40-80 Δ (3 or 4 muscles)

(from William E. Scott)

Angle BLRc MRs BMRs
40 7 mm 4 mm X
45 7 mm 5 mm X
50 7 mm 6 mm X
55 7 mm and→ 4 mm
60 7 mm and→ 5 mm
65 7 mm and→ 6 mm
70 7 mm and→ 7 mm
80 8 mm and→ 7 mm

Use adjustable suture whenever possible on 1 LR up to 60 D, on both LR on deviations >60Δ

Exotropia Monocular Surgery

(from Kenneth W. Wright)

Angle LRc MRs
15 4.0 mm 3.0 mm
20 5.0 mm 4.0 mm
25 6.0 mm 4.5 mm
30 6.5 mm 5.0 mm
35 7.0 mm 5.5 mm
40 7.5 mm 6.0 mm
50 8.0 mm 6.5 mm

Exotropia Binocular Surgery

(from Kenneth W. Wright)

Angle BLRc BMRs
15 4.0 mm or→ 3.0 mm
20 5.0 mm or→ 4.0 mm
25 6.0 mm or→ 5.0 mm
30 7.0 mm or→ 5.5 mm
35 7.5 mm or→ 6.0 mm
40 8.0 mm or→ 6.5 mm
50 9.0 mm X X

Exotropia Surgery in an Ambylopic Eye

(from William E. Scott)

Angle LRc MRs
40 8 mm 7 mm
50 9 mm 7 mm
60 10 mm 8 mm
70 10 mm 9 mm
80 10 mm 10 mm

BLRc: Bilateral Lateral Rectus Recessions
LRc: Lateral Rectus Recession
MRs: Medical Rectus Resection
BMRs: Bilateral Medial Rectus Resections