Worth four dot test is a subjective procedure test to evaluate the presence of fusion, suppression, diplopia and abnormal retinal correspondence. The test can be performed for both distance and near Procedure: Ask the patient these questions Interpretation All below mentioned interpretation is for eyes when red glass is in front of the patient’s right … Read more
The Bruckner test is a simple yet very useful objective assessment for diagnosing abnormalities of the eye and refractive errors. The ophthalmoscope light is shone onto the eye and the light reflected from the fundus is observed. The interpretation of the finding is based on the position of the corneal light reflex and the colour … Read more
The keratometer is a specialized instrument used by optometrists and ophthalmologists to measure the curvature of the cornea. This measurement is important because it helps optometrists/ophthalmologists diagnose and manage a variety of eye conditions, such as astigmatism and keratoconus. In this blog post, we will discuss what a keratometer is, how it works, and why … Read more
A lensometer is an optical instrument that is used to determine the refractive power and the prescription of eyeglasses or contact lenses. It is a crucial tool in the field of optometry. Mainly used for measuring the back vertex power and front vertex power Two types of lensometer are available Manual lensometer The lensometer working … Read more
Retinoscopy is an optical diagnostic test used by eye care professionals to determine the refractive error of a patient’s eyes. It is a quick and accurate method of measuring the amount of correction required to produce a clear vision. The test is performed using a device called a retinoscope, which is an instrument that shines … Read more
Introduction of JCC Jackson crossed cylinder is a combination of two cylinders of equal strength but of an opposite sign placed with their axis at 90 degrees to each other and mounted in a handle. Also known as the flip cross technique Principle of Jackson cross cylinder When light rays passed through an optical system … Read more
Duochrome test is a manual procedure that is performed as part of the subjective refraction process. Duochrome test is performed using a distance visual acuity chart with black letters, and the chart is split equally into two identical halves. Left side of chart have letter on a red background and right side of chart have … Read more