What does the "Spherocylinder" indicate in a prescription?

A spherocylinder indicates the need for both spherical and cylindrical corrections in a prescription, which is essential when dealing with astigmatism. Astigmatism is a refractive error caused by an irregular shape of the cornea or lens, leading to blurred or distorted vision. The spherical component of the prescription corrects for nearsightedness or farsightedness, while the cylindrical component addresses the irregularity in the curvature of the eye.

By combining both powers in one descriptor, the prescription concisely communicates the total refractive correction needed for the patient, facilitating the creation of eyeglasses or contact lenses that can effectively enhance vision. This dual specification is crucial since individuals with astigmatism require tailored correction to provide a clear visual experience at various distances.