Rectus Muscle Surgery for Hypotropia and Hypertropia
For reasonably comitant vertical deviations, recession and resection of vertical rectus muscles are appropriate. Recessions are generally preferred as a first procedure. Approximately 3Δ of correction in primary position can be expected for every millimeter of vertical rectus muscle recession. For comitant vertical deviations less than 10Δ that accompany horizontal deviations, displacement of the reinsertions of the horizontal rectus muscles in the same direction, by approximately one-half the tendon width (up for hypotropia, down for hypertropia), performed during a recess-resect procedure, is often sufficient.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.