Calculate the central magnification of an eye - camera system

This integration demonstrates how PAROS can be used to calculate the central magnification of a fundus image. More information can be found at our GitHub repository.

To calculate the magnification of a fundus image, enter the parameters of the eye in the calculator below. If you do not have all required parameters, it is possible to estimate some parameters:

• The posterior corneal curvature can be estimated as 0.81 x anterior corneal curvature. To do this, click the Estimate posterior corneal curvature button.
• The posterior lens curvature can be fitted from the spherical equivalent of refraction. To do this, click the Fit posterior lens curvature button.

The magnification is calculated in units of pixels per millimeter (px/mm). For example, a magnification of 161 px/mm means that 1 mm on the retina corresponds to 161 pixels in the fundus image.