Steps of the cross-cylinder to Spherocylinder Step 1: Choose either one cross cylinder out of two, as the sphere. Step 2: Subtract the cross-cylinder which was taken as the sphere from the other cylinder which was not taken as the sphere in step 1. Step 3: Axis of the sphero cylinder form is the same … Read more
Another way of writing lens prescriptions is cross-cylinder form. Usually, this form is never used to write spectacle lens prescriptions. However, it gives you an in-depth understanding of the power of each meridian without the need to add or subtract. Or it divides Sphero-cylinder prescription into two Plano cylinders with their axis 90 degrees apart … Read more
It’s a method of converting spectacle prescriptions from one cylinder form to another i.e. plus cylinder to minus cylinder or vice-versa Steps of simple transposition: Step 1: Axis change: If the axis of the cylinder is equal or less than 90 degrees, add 90 degrees If the axis of the cylinder is more than 90 … 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
Eye testing has come a long way since the traditional charts and lenses. The advent of technology has led to the development of computerized eye testing, which made the process of eye examination quicker. Is computerized eye testing always accurate? Computerized eye testing can predict the power of the eye accurately, but computerized eye testing … 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
Colored contact lenses with power provide individuals with both a cosmetic and a functional solution to their vision needs. These contacts not only enhance the appearance of the eyes with a variety of shades, but also correct near-sightedness, far-sightedness, and astigmatism. Type of color contact lenses With the advances in contact lens technology, colored contacts … Read more
Dry eyes can be a frustrating and uncomfortable experience, especially at night when it can make it difficult to fall asleep and wake up feeling refreshed. There are a few steps you can take to alleviate the symptoms of dry eyes and help get a good night’s sleep. Causes and solution of dry eyes at … Read more
Technology has revolutionized the way we live and work, but it has also brought about a new kind of strain – digital eye strain. With the rise of smartphones, laptops, and other digital devices, more people are experiencing eye fatigue, headaches, and other symptoms of digital eye strain. What is Digital Eye Strain? Digital eye … Read more