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I removed the Prentice rule example, because it is not written for a nonspecialist audience. As it was it was incomprehensible to anyone not familiar with the specialized terminology and notation of optometry. It could perhaps be included if rewritten in plain English, without assuming specialized knowledge.-- Srleffler ( talk) 06:57, 2 June 2013 (UTC) [ reply]
Aphakia is the absence of the lens of the eye, due to surgical removal, such as in cataract surgery, a perforating wound or ulcer, or congenital anomaly. It causes a loss of ability to maintain focus ( accommodation ), high degree of farsightedness ( hyperopia ), [1] and a deep anterior chamber. Complications include detachment of the vitreous or retina, and glaucoma .
The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface. All the deviation caused by the prism takes place at the exit surface.
Certain abbreviations are current within the profession of optometry. They are used to denote clinical conditions, examination techniques and findings, and various forms of treatment.
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses ( elements ), usually arranged along a common axis. Lenses are made from materials such as glass or plastic and are ground, polished, or molded to the required shape. A ...
Tape correction (surveying) In surveying, tape correction (s) refer (s) to correcting measurements for the effect of slope angle, expansion or contraction due to temperature, and the tape's sag, which varies with the applied tension. Not correcting for these effects gives rise to systematic errors, i.e. effects which act in a predictable manner ...
Prism (styled as p r i s m) is a 2018 opera by Ellen Reid that explores the post-traumatic stress experience after sexual assault. Reid received the 2019 Pulitzer Prize for Music for her work on the opera.
Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...