Dr. Raúl Martín Herranz
Sara Ortiz Toquero
Guadalupe Rodríguez Zarzuelo
Dr. Victoria de Juan Herráez
Calculate the keratometry corneal radius of curvature in dioptres and millimetres.
Calculate the contact lens power with the spectacle prescription; designed for 12 millimetres vertex distance (use it in prescriptions higher of 4 dioptres).
Calculate the corneal astigmatism with corneal keratometry in millimetres or dioptres.
Calculate the refractive effect of the tear meniscus in gas permeable contact lenses fitting.
Calculate the induced astigmatism in gas permeable toric contact lenses fitting.
Insert both BOZR and the keratometry values to calculate the refractive effect of tear meniscus. If the induced astigmatism is greater than 1 D is recommended to fit a bitoric lens that compensate this induced astigmatism in anterior surface of the lens, verified by over-refraction.