Figure 1

Representative slit-lamp photographs and thermograms from the good and poor intraocular pressure control group are shown. Dotted lines are drawn along the edge of the filtering bleb. Case 22 (A, B) belongs to the good IOP control group and case 35 (C, D) belongs to the poor IOP control group. Each thermogram is divided into eight different colours in 0.2°C steps from dark blue to pink. In the forward gaze (A, C), the cornea is displayed as blue or green and the temporal and nasal bulbar conjunctiva as red or pink. In the downward gaze, the filtering bleb of the good IOP control group (case 22; (B)) is shown as green or blue, meaning that its temperature is clearly lower than that of the surrounding bulbar conjunctiva. Meanwhile, the filtering bleb of the poor IOP control group (case 35; (D)) is represented as yellow or pink, meaning that its temperature is almost same as that of the surrounding bulbar conjunctiva.