1.2.- Select subject data (optional)

Subjects Layout -> Press over the subject -> Select the variable to add -> Select the value for the variable -> Press save

BigSIA allows you to save specific data of a subject in order to build prediction models outside the App. For parameters related with the eye, only one eye can be inserted because models should be built only with one eye. Take care for selecting a protocol (eye specific) that allows you to filter the data properly outside the app.

SIA calculator


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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