Cryoprobe with T-tip for retinal surgery.

Obviously, the T-probe indents as the thimble indentor. Most tears are dealt with readily by three applications. The first is given so that the freeze reaches the posterior rounded margin of the tear, the second is given across the tear, and the third touching the anterior angles of the tear (Fig. 3). After the first application it is a simple matter to bring the probe forwards for the next freeze and then the third. Areas of lattice or lattice with holes are readily treated, since they are usually disposed in a circumferential fashion and one or two applications in any meridian are usually enough. Similarly, dialyses can be conveniently treated. Monitoring shows that the freeze appears first in one area of the indent and then spreads to the remainder. As with the conventional probe, the freeze is delayed in transconjunctival cryotherapy when an area of choroid deep to a muscle is being treated. Satisfactory pigmentation of Chignell's Grade II type (Chignell and others, 1971) is produced with appropriate application. I have used the probe in over 20 cases, producing with it a