SIA Calculator data sheet

Eight data marked by * are mandatary to enter.

Size of incision – Size of scleral/corneal incision in mm (2-9)

Incision location – Site of incision in degree (0-180)

Steep K - Anterior keratometry of steep meridian in Diopter.

Flat K - Anterior keratometry of flat meridian in Diopter.

Steep axis – Steep meridian value in degree (0-180)

Remark – may enter-

WTW (white to white) or

External incision location from limbus, etc.

Valid Y – Yes

N – No, recheck eight mandatory data marked by * star.

SIA Calculator results

Vector SIA – Individual SIA measured by vector method and its axis.

Polar SIA – Individual polar value of two components

1- KPΦ magnitude of flattening & steepening effect & its results.

2- KP (ϕ+45) magnitude of torque effect & its direction.

Success in diopter – (ΔK) change in cylindrical power in Diopter.

Coupling ratio – It is the ratio of flattening of incised meridian to the steepening of the opposite meridian.

Δ SEQ – It is change in spherical equivalent.