**8. A bandage contact lens**

cases receive higher concentration of MMC. The deposited MMC is left as such,its dilution starts as soon as the track is made and aqueous starts draining. The mainstream glaucoma surgery does not give a thought to lymphatics. We believe that they are the crux of success‐ ful filtration surgery. It is a great satisfaction that they are not damaged by MMC with the concentration used. An MTF opening is small compared to tracks made with other techni‐ ques. Therefore it is all the more important that it should not get scarred on the outside.

464 Glaucoma - Basic and Clinical Aspects

**Figure 21.** A 35 years old case of MTF, shows the presence of filled lymphatics under the conjunctiva, one month after surgery, both on slit lamp optical section and with OCT. The OCT image is particularly striking. IOP is 9 mm, down from

35 mm.

A bandage lens provides a soft lid over the external opening of MTF. It helps to maintain the depth of the anterior chamber. At the time of surgery there is already formed a bleb that pre‐ vents it from occupying its intended place. However, after 3-4 hours, when the taped eye is opened, the bandage lens shall be found sitting over the track. The bandage lens may be re‐ moved after a week or two. If no bleb is seen under the bandage lens, it is a sign that some‐ how the iris has blocked the track from inside.

**Figure 22.** A bandage lens over two MTF tracks.The anterior chamber has good depth.OCT shows a bandage contact lens riding over track area
