Surgical Outcome of Medial Rectus Resection in Recurrent Exotropia: A Novel Surgical Formula

Table 3

Examples for calculating amount of MR muscle resection.

Amount of; exotropia (PD)	Unilateral or; bilateral	Total amount of MR muscle resection; (5 PD per 1 mm + 0.5 mm per muscle resected)	Total MR muscle; resection per eye (mm)
55	Bilateral	11 + 1.0 mm	6
40	Bilateral	8 + 1.0 mm	4.5
20	Unilateral	4 + 0.5 mm	4.5
15	Unilateral	3 + 0.5 mm	3.5

PD: prism dioptres, MR: medial rectus.