How does corneal curvature (average K-value) affect the data?
Corneal curvature information is used in combination with focus information to correct for magnification. ——————————————————————————– • The focal length of the eye and, therefore, the absolute scaling of acquired HRT images is dependent on the radius of curvature of the anterior corneal surface. • If no other value is entered, the HRT software uses a default value of 7.7 mm. • If the correct radius of corneal curvature is different from that default value and not entered properly, the measurement results will be not be correct. • The amount of error in the measurement results increases with increasing deviation of the actual radius of corneal curvature from the assumed default of 7.7 mm. • Corneal curvature only needs to be entered at baseline, and does not have to be updated unless the patient undergoes invasive surgery or has some other procedure/treatment that dramatically effects corneal curvature. After surgery, the corneal curv
