Jackson Cross Cylinder

Product Description

Jackson Cross Cylinder

The Jackson cross-cylinder is a lens of fundamental importance in optometry with a key role in the refraction routine. And yet it appears not to be as well understood as perhaps it should be. The purpose of this paper is to examine the linear optical character of the Jackson cross-cylinder and, in particular, those properties associated with the operations performed on the lens in the refraction routine, namely flipping and turning. Corresponding to these operations in physical space are steps in an abstract space, symmetric dioptric power space. The powers of all Jackson cross-cylinders lie in the plane of antistigmatic powers in the abstract space. In particular the powers of an F Jackson cross-cylinder (for example, a 0.5-D Jackson cross-cylinder has F = 0.5 D) lie on a circle of radius F centred on null power. Flipping the lens takes one diametrically across the circle; turning the lens takes one around the circle at twice the rate. A subsequent paper shows how these operations work in defining the cylinder in the refraction routine.

Precision in Astigmatism Testing

The Jackson Cross Cylinder is designed for ophthalmologists and optometrists to fine-tune astigmatic measurements during eye exams. With stainless steel construction and advanced laser technology, it offers both longevity and high precision, making it a trusted tool in professional clinical environments throughout India.


Tailored for Clinical Use

Weighing just 10-100 grams, this manual device fits comfortably in hand, allowing smooth and efficient manipulation during eye examinations. Its lightweight yet robust build ensures comfort and accuracy for both practitioner and patient, enhancing the overall effectiveness of the refraction process.


Reliable Supply Across India

As a widely distributed product, the Jackson Cross Cylinder is readily available through reputable manufacturers, suppliers, exporters, and traders in India. Medical professionals can easily procure this essential tool to advance their clinical offerings and improve patient outcomes.