Using smartphone flashlight as slit lamp light source.

In the event of a power outage, the smartphone flashlight may be used as a light source for the slit lamp. First, the outer casing of the slit lamp tower is removed [Fig. 1], followed by the removal of the bulb and the condensing lens [Fig. 2]. The phone flashlight is turned on, centered over the slit apparatus and taped in place [Figs. 3 and 4]. This produces a bright slit beam of adjustable height/width comparable to that of the original bulb. The cobalt blue filter can be applied as needed. This low-cost setup may be useful in an emergency when the power outage occurs unexpectedly when there is a bulb malfunction without an adequate replacement, or in areas of low resources during electricity rationing.[1]

Figure 1

The outer casing of the slit lamp tower is removed

Figure 2

The bulb and condensing lens are removed

Figure 3

Smart phone flashlight is turned on, centered over the slit apparatus and taped in place

Figure 4

A bright, adjustable slit beam is produced

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