Optics and refraction

Type of ophthalmic lens and its properties

Type of ophthalmic lens and its properties To get optometry vacancy update join Channel below ◻️ WhatsApp Cha…

How to check distance visual acuity ?

Procedure for Distance vision: • Illumination should be adequate ( 100 foot candles) • Customer is asked to…

Optical Media and Indices of Refraction

Optical Media and Indices of Refraction A medium is any material that transmits light. Light travels at diffe…

Snell’s Law of Refraction

Snell’s Law of Refraction The ratio to the sine of the angle of incidence to the sine of angle of refraction…

Optical aberrations of the normal eye

Optical aberrations  The eye, in common with many optical systems in   practical use, is by no means opticall…

Why image jump in bifocal glasses ?

Why image jump in bifocal glasses ? When looking from distance portion to the near portion of a bifocal len…

How add the spectacle power ?

How add the spectacle power ? What is Addition in optometry ?   When the patient have distance and near vi…

Laws of refraction

Laws of refraction Refraction is defined as the change in direction of light when it passes from one transp…

Laws of reflection - Optics and refraction

LAWS OF REFLECTION Light travels in straight line until it meets a surface that separates the two media. W…

STENOPAIC SLIT USED IN OPHTHALMIC PRACTICE

STENOPAEIC SLIT USED IN OPHTHALMIC PRACTICE Stenopaic slit is an elongated pinhole which is used to allow …

PRISM LENSES IN OPHTHALMIC PRACTICE

PRISM LENSES IN OPHTHALMIC PRACTICE Prism lenses are triangular or wedge-shaped piece of glass or plastic t…

GRINDING OF LENSES IN OPHTHALMIC PRACTICE

GRINDING OF LENSES IN OPHTHALMIC PRACTICE It is a procedure by which we convert a slab of glass (blank) into …

TYPES OF BIFOCAL LENSES

Bifocal lenses meaning Bifocal lens means the optical lense contain two power or two power segment with diffe…

PANTOSCOPIC TILT IN OPHTHALMIC PRACTICE

PANTOSCOPIC TILT IN OPHTHALMIC PRACTICE                     It is the angle between the plane of the lens/fra…

What is the vertex distance?

Meaning vertex distance This is the distance between the corneal apex and the center of the correcting specta…

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