Shadow251

The first successful contact lenses which were originally molded to conform to the shape of the cornea were known as - Scleral/Haptic lenses Corneal contact lenses: - are the most common design for rigid and gas permeable lenses. The majority of soft lenses fit today are: - semi-scleral A liquid coming in contact with a hydrophilic lens material with a relatively small wetting angle would be likely to: - spread evenly over its surface A contact lens with diameter larger than that of the corn...

Optic Zone - Central portion of a contact lens which contains the refractive power (generally corresponds to the corneal cap) Posterior Apecal Radius - Spin-cast soft lenses. (Curvature of posterior surface changes with refractive power. Measured at apex of posterior surface) Steeper Base Curve - As the Posterior radius of curvature is decreased the base curve becomes: (i.e. 8.4-8.1) Flatter Base Curve - As the Posterior radius of curvature is increased the base curve becomes: (i.e. 8.1-8.4) Bi...

Diffused Illumination – -Uses widest slit, longest aperture -Light source positioned at an angle of 40º-50º -Used to view overall areas, to observe the ocular adnexa, cornea, sclera, lids, conjunctiva, lens surface, and CL fitting characteristics Direct Illumination – -Most important/useful illumination -Light source positioned at an angle of 40º-50º to oculars -Light beam and oculars are focused in coincidence on area being evaluated -The difference in the illumination is not the angle...

The cornea is clear, and must remain clear, which means that it must be , have regular cell structure, and be free from . avascular, scarring The layers of the cornea from the outermost layer to the innermost layer in order are: Epithelium Bowman's Layer Stroma Descemet's membrane Endothelium In a normally healthy eye, minor corneal abrasions of the cornea are generally repaired within hours by mitosis and migration of fellow cells. 48 Which layer of the cornea does NOT regenerate a...

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 from 1 Aq...

NCLE Practical broken down based on the ABO-NCLE practical Exam Candidate Handbook Practical Test Specifications sheet

1. what medications may affect successful contact lens wear Antihistamines are beneficial when treating allergies and cold symptoms because they dry out the mucous membranes of the nasal passage. However, this may also lead to dehydration of the tear film. Antihistamines have also been known to slow down the blink rate and increase corneal sensitivity. 2. Sensitivity to light is known as . Photophobia refers to a sensitivity ("phobia") to light ("photo"). Presbyopia is the condi...

Which medication may affect successful contact lens wear? - Antihistamines Antihistamines are beneficial when treating allergies and cold symptoms because they dry out the mucous membranes of the nasal passage. However, this may also lead to dehydration of the tear film. Antihistamines have also been known to slow down the blink rate and increase corneal sensitivity. What is the term that refers to a sensitivity to light? - Photophobia What is the condition called when a patient can no longer...

annular bifocal contact - A lens with distance portion ground into the center of the lens and the near portion ground into the periphery aphakic lenses - lenses designed for post-cataract fitting apical zone of cornea - the central portion of the cornea with a constant radius of curvature. Also called the corneal cap. artificial tears - medications, many of them over the counter, to treat dry eyes aspheric lens - A non-spherical lens, in which the radii of curvature increase towards the peri...

What is the mucous membrane that covers the sclera and lines the inside of the eyelids? - Conjunctiva Which refractive error is commonly referred to as "far-sighted"? - Hyperopia Which of the following refractive errors results in light coming to a point of focus in front of the retina? - Hyperopia Which of the following refractive conditions refers to the age-related, gradual loss of accommodation? - Presbyopia Which refractive error is commonly referred to as "near-sighted"? - ...