Hoya eDitest

eDitest is a free app that allows:

• estimate diameter of the lens
• measure pantoscopic angle
• transpose spherocylindrical lens record
• calculate required lens power according to vertex distance
• calculate contact lens power when optical lens power was given
• calculated optical lens power when contact lens power was given
• calculate prismatic tolerance of mounted & uncut lenses
• determine additional lens decentration associated with the use of prismatic correction
• perform solving and resolving on prisms
• calculate the spherometric power of lens curvature for different index materials
• calculate spectacle magnification