Optics & Refraction Archives

PROGRESSIVE GLASS

Post author:Riju Ghosh
Post published:July 1, 2023
Post category:Optics & Refraction
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It's also known as progressive lenses, multifocal lenses, progressive addition lenses, varifocal lenses, progressive piwer lenses, varifocal lenses, progressive power lenses or graduate prescription lenses. It's a type of eyeglass…

Role Of Astronomical Telescope In Optometry

Post author:Dwiparna Chatterjee
Post published:May 11, 2023
Post category:Optics & Refraction
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The Astronomical( kepler’s) Telescope consists of two convex lenses separated by the sum of their focal lengths. This type of system produces a Magnified inverted image. Prisms or mirrors are…

JACKSON CROSS CYLINDER

Post author:Sonal Chaurasia
Post published:April 19, 2023
Post category:Optics & Refraction
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Jackson cross cylinder is a single low power lens, which is a combination of a plus cylinder and a minus cylinder of equal power with axis perpendicular to each other,…

OPTICS OF THIN LENS

Post author:Dwiparna Chatterjee
Post published:March 28, 2023
Post category:Optics & Refraction
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In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the radii…

ADVANCES IN THE TREATMENT OF PRESBYOPIA

Post author:Joseph Nnagha
Post published:March 10, 2023
Post category:Optics & Refraction
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Presbyopia affects 1.8 billion people worldwide, according to the World Health Organization (WHO). The American Academy of Ophthalmology (AAO) describes it as a common age-related decline in the eye’s near…

Procedure of Fundus Examination

Post author:Megha Sinhababu
Post published:December 27, 2022
Post category:Optics & Refraction
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An exam that uses a magnifying lens and a light to check the posterior segment of the eye, including the retina and optic nerve is called Fundus Examination. It is…

RETINOSCOPY

Post author:Ritika Das
Post published:July 27, 2022
Post category:Optics & Refraction
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Retinoscopy is also known as skiascopy, shadow test or pupilloscopy or koreoscopy. It was introduced by Bowman in 1859. It is an objective method of finding out the error of…

$Autorefractometry$

Autorefractometry

Post author:Sritama Guchhait
Post published:July 26, 2022
Post category:Optics & Refraction
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What is the meaning of Refractometry ? It is the estimation of refractive error with a machine called refractometer or optometer. Autorefractometry An autorefractor is an alternative method of finding…

MODERN REFRACTOMETERS

Post author:Riju Ghosh
Post published:July 25, 2022
Post category:Optics & Refraction
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With the rapid development in electronics and micro computers a number of innovative methods & instrument for automated clinical refraction have appeared since 1960. Refractometer is used to determine the…

STREAK RETINOSCOPY

Post author:Shilpi Mondal
Post published:July 18, 2022
Post category:Optics & Refraction
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WHAT IS RETINOSCOPY RETINOSOPY also called as skiascopy or shadow test is an objective method of finding out the error of refraction by the method of neutralization. PRINCIPAL RETINOSCOPY is…