Care of Contact lenses
When the lens is received from the manufacturer it is sterile, so where does the infection come from? Clearly, most of the complications with contact lens are because of the…
Light
This is a fact that we cannot see any object in a perfectly dark room conclusively establishes the truth that light is necessary for the purpose of vision. Nature has…
Tear Film & Contact Lens Interaction
The precorneal tear film plays a major role in the maintenance of the functional integrity of the cornea. It protects, nourishes & lubricates the cornea. The cornea is made up…
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…
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