Prescription Vertex Correction Calculator

Correcting for Vertex Distance

In the field of optometry, precise measurements and corrections are crucial to providing optimal vision care, and vertex correction is an essential aspect of this process. Vertex correction adjusts the power of a contact lens or eyeglass prescription based on the distance between the back surface of the lens and the cornea, known as the vertex distance. This adjustment is particularly important in prescriptions over ±4.00 diopters, where the effective lens power can significantly differ depending on the vertex distance. By applying vertex correction, optometrists ensure that corrective lenses provide the exact refractive power needed at the corneal plane, which is vital for patients with high myopia or hyperopia to achieve accurate visual correction and comfort. Without this correction, patients may experience under- or over-correction, leading to suboptimal vision and discomfort. This practice ensures that the prescribed lenses achieve the intended visual correction, leading to improved patient satisfaction and better visual outcomes.

Vertex Correction

Standard Distance (12mm)
Minus RxSRxPlus Rx