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Definition
 
enEnglish
PRISM, BAR, OPHTHALMIC definition: An ophthalmic bar prism is a device that is a bar composed of fused prisms of gradually increasing strengths intended to measure latent and manifest strabismus (eye muscle deviation) or the power of fusion of a patient's eyes.
ENDOSCOPE, PRISM definition: An endoscope and accessories is a device used to provide access, illumination, and allow observation or manipulation of body cavities, hollow organs, and canals. The device consists of various rigid or flexible instruments that are inserted into body spaces and may include an optical system for conveying an image to the user's eye and their accessories may assist in gaining access or increase the versatility and augment the capabilities of the devices. Examples of devices that are within this generic type of device include cleaning accessories for endoscopes, photographic accessories for endoscopes, nonpowered anoscopes, binolcular attachments for endoscopes, pocket battery boxes, flexible or rigid choledochoscopes, colonoscopes, diagnostic cystoscopes, cystourethroscopes, enteroscopes, esophagogastroduodenoscopes, rigid esophagoscopes, fiberoptic illuminators for endoscopes, incandescent endoscope lamps, biliary pancreatoscopes, proctoscopes, resectoscopes, nephroscopes, sigmoidoscopes, ureteroscopes, urethroscopes, endomagnetic retrievers, cytology brushes for endoscopes, and lubricating jelly for transurethral surgical instruments. This section does not apply to endoscopes that have specialized uses in other medical specialty areas and that are covered by classification regulations in other parts of the device classification regulations.
READER, PRISM, OPHTHALMIC definition: An ophthalmic prism reader is a device intended for use by a patient who is in a supine position to change the angle of print to aid reading.
PRISM, GONIOSCOPIC definition: A gonioscopic prism is a device that is a prism intended to be placed on the eye to study the anterior chamber. The device may have angled mirrors to facilitate visualization of anatomical features.
PRISM, FRESNEL, OPHTHALMIC definition: An ophthalmic Fresnel prism is a device that is a thin plastic sheet with embossed rulings which provides the optical effect of a prism. The device is intended to be applied to spectacle lenses to give a prismatic effect.
PRISM, ROTARY, OPHTHALMIC definition: An ophthalmic rotary prism is a device with various prismatic powers intended to be handheld and used to measure ocular deviation in patients with latent or manifest strabismus (eye muscle deviation).
 
deGerman
Prisma definition: [1] Optik: ein durchsichtiger, meist keilförmiger Körper, der von mindestens zwei sich schneidenden ebenen Flächen begrenzt wird [2] Geometrie: Körper, der durch zwei deckungsgleiche und parallele Flächen und mehrere Mantelflächen begrenzt wird
 
frFrench
prisme definition: Polyèdre ayant pour bases deux polygones égaux et parallèles, dont les côtés homologues sont unis par des parallélogrammes.
prisme definition: instrument d’optique qui sert à réfracter et à décomposer la lumière et qui est un '''prisme''' triangulaire de verre blanc ou de cristal.
prisme definition:
 
Examples
 

We examined to what extent dissociated and associated phoria predict the “comfortable prism”, i.e. the prism that appears most comfortable under natural viewing conditions.

Joanna M.N. Otto et al.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie 246 (5), 01 May 2008

To determine the comfortable prism, all the Mallett elements, including the Nonius lines, were shown to both eyes.

Joanna M.N. Otto et al.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie 246 (5), 01 May 2008

The range of the intertrial mean was for dissociated phoria from +9.3 eso to −5.9 cm/m exo, for associated phoria from +11.2 eso to −3.3 cm/m exo, and for the comfortable prism from +4.8 eso to −4.1 cm/m exo (cm/m = prism dioptre).

Joanna M.N. Otto et al.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie 246 (5), 01 May 2008

In most observers, the phoria parameters differed greatly from the comfortable prism.

Joanna M.N. Otto et al.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie 246 (5), 01 May 2008

On average, the phoria values were shifted about 2 cm/m towards the eso direction in relation to the comfortable prism (associated phoria not less than dissociated phoria).

Joanna M.N. Otto et al.

Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie 246 (5), 01 May 2008

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