DUOCHROME TEST
The initial Duchrome test, also known as the Bichrome test, consists of two directions, red and green. Color distortion, the basis of the experiment, occurs because different wavelengths of light…
Subjective Refraction
There are two methods of evaluating the refractive error of an eye: Objective refraction, (usually retinoscopy) where the result depends purely on the examiner's judgment to determine the optimum optical…
Auto refractometry
In this modern era of science and technology, when everything is controlled by computerized automated machines. Then why refraction is remained from that list although as an Optometrist we will…
Retinoscopy
WHAT IS RETINOSCOPY?Retinoscopy is a technique to objectively determine the refractive error of the eye. (farsighted, nearsighted, astigmatism) and the need for glasses. The test can be quick, easy, reliably…
Application of Polarized light
Light is a form of energy or a composed of particles of photons. The photon Particles are actually massless bundles of concentrated electro magnetic energy that are travels in a…
Transmission and Absorption
The transmission of Light is defined as the moving of the electromagnetic waves through a material. Visible light is the cause we are able to see anything at all. Transmission…
PHOTOELECTRIC EFFECT
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons…
Chromatic Abberation
Hii…myself Chitu ,the badass 😎😎creature on earth ,Any doubt ?? That was my fb profile picture …I wanna update this on Insta also . But it seems too ‘colourful’ .…
Specular reflection
Specular reflection come from latin word “speculum” which means mirror .Reflection of light where the angle of reflected light equals the angle of incident light ,but on opposite side of…
Schematic Aberrations
An aberration refers to a defect in lens that causes the light to spread and not to converge in the same point to make the image sharp. This may occur…
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