Figure 4
From: A new low-cost, compact, auto-phoropter for refractive assessment in developing countries
Test chart images captured through the fluidic lens setup. (a) The power of the defocus lens is changed from −10 to +10 diopters with two-diopter increments using the servo motor actuated pump. The increments can be as low as 0.1 diopters. (b) Astigmatism chart images. Three-diopter magnitude astigmatism is induced at 0°, 50°, 90°, and 140° using cylindrical lenses placed at 45 degrees with respect to each other. The angle can be controlled by changing the ratio between Z5 and Z6.
