Electro optical devices in low vision
LOW VISION: Low Vision is the term used to describe a significant visual impairment that it cannot be fully corrected with glasses, contact lenses, medication or eye surgery. Depending on…
EXTENDED WEAR CONTACT LENS INTRODUCTION
As technology improve the material and designs of CL wear as benefit from greater flexibility and more choices. Extended wear contacts are, most typically, contact lenses that can be worn…
VISION REHABILITATION
Vision rehabilitation (often called vision rehab) is a term for a medical rehabilitation to improve vision or low vision. In other words, it is the process of restoring functional ability…
CONTACT LENS FITTING IN ASTIGMATISM
Astigmatism is a type of refractive error where in the refraction varies in different meridian. Consequently ,the rays of light entering the eye cannot converge to a point focus but…
MAGNITUDE OF LOW VISION
DEFINITION OF LOW VISION (WHO- World Health Organization): A person with low vision is one who has impairment of visual functioning even after treatment of an operation and standard refractive…
Spasm of accommodation
Introduction - A spasm of accommodation (also known as a ciliary spasm, an accommodation, or accommodative spasm) is a condition in which the ciliary muscle of the eye remains in…
RETINOSCOPY
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
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
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…
PHYSIOLOGOCAL ASPECT OF ACCOMODATION
Physiological accommodation: The accommodation reflex is the visual response for focusing on near objects. It also has the name of accommodation -convergence reflex or the near reflex. It is a…
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