Improve head posture by move the eyes to null position.
Modi?ed Anderson procedure.
For mild to moderate degrees of the face turn, recessions of two recti are done on the agonist muscles.
To move the eyes to the null position, where the nystagmus is minimal.
Improve visual acuity.
Four muscle recessions.
Four horizontal recti recessions.
Improve the visual acuity without eyes turns to null position.
In the surgery of recession procedure, the extraocular muscle will be detach from the eye and then it will be reattaches it (resection) farther back on the eye than the original position. This cause the strength of the muscle will weaken. This used to correct alignment related to strabismus with strong muscle.
If the muscle is too weak, recession procedure is used to reduce strength of the opposing muscle (antagonist) to achieve more equal function of the eye muscles. This result in better eye alignment.