Primary retinal detachments without apparent breaks.

In a prospective study of 415 consecutive eyes operated on for retinal detachment, there were no apparent retinal breaks in 41 eyes. Examination of the most likely site for breaks during, or shortly after, cryotherapy was helpful in detecting tiny breaks in several cases. All detachments without apparent breaks were operated on with a three-step operation: we applied two rows of confluent cryotherapy to all retinal breaks, drained subretinal fluid, and used buckles just anterior to the equator. Surgical cure, defined as reattachment for at least six months, was achieved in 93% of eyes with apparent breaks, and in 85% of eyes without apparent breaks. The latter figure increased to 91% when the seven patients with preoperative massive preretinal retraction were excluded.