Surgery for exotropia 
(symmetrical medical rectus resection OR lateral rectus recession)

Amount of esotropia  (prism dioptres D)	Bilateral medial rectus resestion (mm)	OR	Bilateral lateral rectus recession (mm)
15	3.0		4.0
20	4.0		5.0
25	5.0		6.0
30	6.0		7.0
40	6.0		8.0

X6.0

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Success in MRCOphth