Study of ocular motility and of the relative visual acuity in patients who have been treated for retinal detachment emphasize the need for early treatment, especially when the macula is involved, and for selection of the simplest method of retinopexy that is thought to be adequate. It is important to avoid unnecessary trauma to the motor and suspensory system of the eye. Prismatic correction should be employed without delay in those patients who develop heterotropia after re-attachment of the retina.'1 seldom treat strabismus cases, but I often cause oculomotor trouble. When my operation is sucessful, my patients often get double vision', an outstanding retinal detachment surgeon once wittily remarked.Lack of binocularity is not uncommon after retinal detachment surgery and is more likely to occur with the more frequent use of operative methods that may considerably modify the shape of the eye. Yet diplopia and asthenopia are less common complaints in patients cured from retinal detachment -and with good vision in both eyes -than one would expect from the frequency of postoperative imbalance from damage to the motor and suspensory system of the eye, from irregular changes of the eyeball, or from macular heterotopia. * Policlinica Sagrado Corazon -Ophthalmic Department (Barcelona -Spain). Directors: Drs. A. ARRUGA and F. PALOMAR-PETIT.