Partial iridocyclectomy and sclerectomy.

Preparation. The area of bulbar conjunctiva within the circumvallation was later removed en bloc with the 12 x 7 mm. area of sclera over the ciliary body. The bulbar conjunctiva was then incised just peripheral to the diathermy circumvallation and the incision was extended round the limbus to 12 o'clock and 6 o'clock. From each end radiating incisions 8 mm. long were made posteriorly. The conjunctival flap was undermined for about 12 mm. and the flap reflected posteriorly by sutures clamped to the head towel (Fig. 3, opposite). The medial rectus muscle was divided in advance of two mattress sutures of 5/0 chromic catgut; this is an important step in assisting the reduction of intra-ocular pressure and in preventing scleral compression when the eye is held in lateral rotation by traction sutures in the superior and inferior rectus muscles to effect a position in which the area of operation lies uppermost.