Figure 1.

Moorfields conjunctival fornix depth measurer. (a, b) Polymethylmethacrylate biconcave fornix measurer constructed by hand with an embedded ruler. Black lines are at 2 mm intervals, red lines are at 10 mm intervals. (c, d) The fornix measurer was inserted after instillation of 1 drop of proxymetacaine hydrochloride 0.5%. Subjects were asked to look up for measurement of the lower fornix, and to look down for measurement of the upper fornix. A central fornix depth measurement was obtained by identifying which mark aligned with the posterior lid margin.