Certified Ophthalmic Technician (COT) Test 2025 – 400 Free Practice Questions to Pass the Exam

The Kestenbaum rule is specifically designed to assist in determining the appropriate level of magnification necessary for low vision patients to effectively read. This rule is based on the relationship between the patient's visual acuity and the visual acuity required for comfortable reading. It provides a formula that helps practitioners calculate the necessary magnification needed for patients with reduced vision to read standard print sizes.

For example, if a patient has a visual acuity of 20/200 and needs to read at 20/40 level, the Kestenbaum rule would help translate that visual requirement into a magnification factor. This practical application makes the Kestenbaum rule particularly useful in low vision therapy and rehabilitation, where the goal is to maximize reading capabilities.

The other terms listed do not pertain specifically to calculating magnification for low vision patients. The Snellen rule is generally associated with visual acuity measurement, the LogMAR scale is used for more precise measurement of visual acuity, and Duane's rule relates to ocular motility and muscle function rather than magnification requirements.