1.7.- How to change the Contrast for measuring Low Contrast Visual Acuity?

Select the Contrast Percentage -> Use the Test at the Desired Distance

Low Contrast visual acuity can be measured with the VisionC test, you only have to select the desired percentage

SIA calculator

BigSIA

The incision that is required for IOL implantation during cataract surgery induces astigmatism —this is referred to as surgically induced astigmatism (SIA)— so the total amount of astigmatism to be corrected with the toric IOL must consider the flattening (FE) or steepening (SE) effect on the meridian of the preoperative corneal astigmatism on which the IOL is going to be aligned. The SIA will depend on several factors, including incision type, location and size, and its design or architecture. 

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