C.v.instruments Jackson Cross Cylinder Diopter (-0.25& -.50) Jackson Cross Cylinder

Designed with precision in mind, the Jackson Cross Cylinder is a specialized ophthalmic lens that plays a crucial role in fine-tuning eyeglass prescriptions. It's particularly effective in diagnosing and correcting astigmatism, a common refractive error characterized by irregularities in the curvature of the cornea or lens. This versatile lens, also known as a Cross Cylinder, features two lens powers oriented perpendicular to each other. By rotating the lens, eye care professionals can selectively add or subtract cylindrical power from a patient's prescription, allowing for precise adjustment to achieve optimal visual acuity. During an eye examination, the Jackson Cross Cylinder is often employed in conjunction with a phoropter, a device used to test multiple lens combinations and determine the most suitable corrective lenses for the patient. The lens is manipulated to refine the prescription, ensuring maximum clarity and comfort for the individual. The Jackson Cross Cylinder test is a fundamental component of vision testing procedures, providing valuable insights into the patient's refractive status and guiding the prescription process