Equipment for measuring the power of Progressive Addition Lenses

An optical device designed and manufactured at the Universidad Nacional de Colombia to characterize the refraction of progressive addition ophthalmic lenses is described.The operating principle of the device is the modified Hartmann test.The device evaluates in-frame or uncut lenses.It includes a linear translation stage that allows to measure a wide dynamic range of the refractive power of the lenses, an Arduino module to control the equipment functions, a Raspberry pi module with an application that processes the images, and a touch screen to operate the equipment and display the spherical power and cylinder maps of the lenses.