Figure 3.

Differences in 2 types of spectrophotometer. (A) Double Beam Spectrophotometer. The transmittance was measured from the difference between the control and the sample IOL light. This method detected only the light converged to the detector passes through the IOL optic. The scattered light is not detected. So the result becomes lower than the result using integrated sphere spectrophotometer. (B) Integrated Sphere Spectrophotometer. This integrated sphere detects all the light transmitted through the IOL optic. And, the scattered light is also detected. So the result becomes higher than the result using double beam spectrophotometer.