Ncle Exam, Practice Exam And Study Guide Exams

Ncle Exam, Practice Exam And Study Guide Exams Actual (Ncle Test Bank)

which two lens parameters determine the sagittal depth of the lens?

• base curve, power
• diameter, base curve
• power, thickness
• thickness, diameter

which of the following is experienced by most soft lens wearers?

• poor vision
• lens dryness
• neovascularization
• superficial punctate keratitis

thicker lenses perform better in all of the following categories EXCEPT:

• lens dryness
• handling

• oxygen permeability
• visual acuity

which instrument is LEAST likely to be used for in-office verification of soft lenses?a . radiuscope

• lensmeter
• slit lamp
• measuring magnifier

which of the following conditions is MOST suitable to soft lens wear?

• marginal dry eye
• intermittent wear
• dusty environment
• irregular corneal astigmatism

in the making of concentric style bifocals, the different power zones

(distance and near) may be ground on:

• the front surface
• the back surface
• either surface
• both surfaces
• either surface

the addition of fluorine to the rigid lens ingredients increases:

• durability

• permeability
• optical quality
• wettability

which of the following instruments would NOT be used to verify the lens diameter in the office?

• diameter gauge
• radiuscope
• measuring magnifier
• projection magnifier

Mounting the lens blank in the lathe so that the face of the button is

perpendicular to the spindle is necessary to avoid:

• heat build-up
• unwanted prism

• cylinder power
• warpage

when reading the radius of curvature of the back surface with the

radiuscope, the lens is floated on a drop of liquid to:

• neutralize the reflection from the front surface
• keep the front surface clean
• level the lens
• none of the above

during the lathing process for topic lenses, cylinder power is generated by:

• using a cylindrical diamond cutting tool
• blocking the lens off center
• squeezing the lens in a crimping tool
• truncating the lens

When the lens power is verified, placing the concave surface against the lensmeter aperture will reveal power.

• effective
• front vertex
• true
• back vertex