Shadow251

The tolerance for the overall lens diameter according to the ANSI standards is: A. +/-0.005mm B. +/-0.05mm C. +/-0.01mm D. +/-0.1mm - B. According to the ANSI standards (Z80.2-1989), the tolerance for the overall diameter of a contat lens is +/-0.05mm. ANSI standards have been developed to maintain quality in the contact lens industry. It is important to have an understanding of the ANSI guidelines. All of the following will enable the practitioner to verify the overall rigid gas permeable lens...

optic zone - the central portion of a contact lens which contains the refractive power and generally corresponds to the central corneal cap posterior apecal radius - this term is generally used in reference to spin-cast soft lenses. the curvature of the posterior surface of the lens changes with the refractive power. the radius of curvature is measured at the apex of the posterior surface. steeper base curve - occurs when the posterior radius of curvature is decreased (i.e. 8.4 to 8.1 mm) flat...

Assessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by the use of thea. profile analyzer b. shadow graph c. keratometer d. burton light - a. profile analyzer Contact lens power should be specified ina. back vertex power b. sphero-cylinder power c. power in situ d. posterier apical radius - a. back vertex power The slit-lamp illumination that gives an overall view of the cornea but limits detail isa. sclerotic scatter b. diffuse c. spec...

A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - a)-4.50 +1.00 x75 When a keratometer is being calibrated, which of the following targets ...

base curve - refers to the radius of curvature of the central posterior surface of the lens. It may be expressed in diopters of surface power (D) or in millimeters (mm) of radius or curvature. optical zone - the chord diameter over which the base curve extends on the posterior surface of the contact lens, described in millimeters secondary or intermediate curves - lies between the base curve and the peripheral curve on the posterior lens surface, usually 0.70mm to 1.50mm flatter than the b...

Steep Fluorescein Pattern - Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - Bright green pooling vertically, faint green pooling horizontally Prism Ballast - Common technique to stabilize lens from rotating. Added thickness will...

Which of the following medications may affect successful contact lens wear? A. Antacids B. Antihistamines C. Aspirin D. Laxatives - B. Antihistimines Which term refers to a sensitivity to light? A. Prebyopia B. Photophobia C. Pannus D. Ptosis - B. Photophobia The following is an example of what type of astigmatism? K's 42.50 @ 180 / 40.50 @ 90 A. With the Rule Astigmatism B. Lenticular Astigmatism C. Against the Rule Astigmatism D. Irregular Astigmatism - C. Against the Rule...

Which of the following medications may affect successful contact lens wear? a. antacids b. antihistamines c. aspirin d. laxatives - antihistamines Which term refers to a sensitivity to light A.presbyopia B.Photophobia C.Pannus D. Ptosis - Photophobia The following is an example of what type of astigmatism? K's 42.50 @180 /40.50 @90 A. with the rule B. Lenticular astigmatism C.Against the rule D. Irregular astigmatism - Against the rule astigmatism The cornea receives nutrients...

Suprasegmental - Aspect of Language (intonation, stress, loudness, pitch level, juncture - (the set of features in speech that enable a hearer to detect a word or phrase boundary), and speaking rate) Segmental - Aspect of Language (phonemes - vowels & consonants) Phonoligical Awareness - The knowledge of and sensitivity to the sound structure of language (umbrella term) It includes: rhyming, segmentation activities, and manipulation activities Segmentation Activities - segmenting sentences i...

decoding - recognition of the visual symbol, symbol/sound correspondence, and blending sounds into a word are all part of- Pre-Reading Stage - language appreciation, awareness of printed words, mastery of alphabet and simple words Greek elements - eu, chloro Current Research on the brain and developmental dyslexia - A "glitch" may have taken place during fetal development Dyslexia and Social Development - May see: a lack of good judgement, the inability to stick with a game, erratic em...