NCLE Prep

Question 1

The tolerance for a rigid lens power under +/- 5.00

Answer 1

0.12

Question 2

The tolerance for the overall lens diameter according to the ANSI standards is

Answer 2

+/- 0.05

Question 3

The average pH value of the human tear is

Answer 3

7.4

Question 4

If the manufacturer’s guidelines suggest a minimum of 4 hours for disinfection, what would you suggest to the patient?

Answer 4

minimum of 4 hours required

Question 5

The cornea has five distinct layers. In order from anterior to posterior they are:

Answer 5

Epithelium, Bowman’s layer, Stroma, Descemet’s membrane, Endothelium

Question 6

A normal tear break-up time is:

Answer 6

10-12 seconds

Question 7

A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is know as:

Answer 7

Arcus Senilus

Question 8

Patients with keratitis sicca are more prone to?

Answer 8

secondary infections

Question 9

The average life span of corneal epithelial cell from mitosis through maturation and desquamation most nearly approximates?

Answer 9

1 week

Question 10

In a Schirmer I test

Answer 10

A patient with an unanesthetized eye and normal tear output should wet at least 15 mm of the filter paper in 5 minutes

Question 11

The preservative in contact lens solutions

Answer 11

Is formulated to keep microorganisms from multiplying in a bottle of contact lens solutions after it has been opened

Question 12

The average HVID for a patient is

Answer 12

11.5

Question 13

To aid in the positioning of a GP prism ballast lens riding too low and slipping underneath the lower lid which of the following might be helpful?

Answer 13

truncation

Question 14

In prescriptions of 4.00 D or greater, fitting contact lenses requires compensating the power for the change in vertex distance. When moving from the spectacle plane to the corneal plane, the compensated power will be?

Answer 14

more plus

Question 15

A prism ballast GP lens requires how much prism for proper orientation?

Answer 15

0.75 to 1.50D

Question 16

The longer the radius of curvature of a contact lens?

Answer 16

flatter the lens

Question 17

Up until the recent introduction of silicone hydrogel lenses the Dk/t of previous hydrogel lenses was limited by

Answer 17

Water content and center thickness

Question 18

Fitting soft lenses steeper than K will usually result in

Answer 18

Fluctuations in vision following the blink

Question 19

A bifocal lens in which the power gradually changes from the central area of the lens to a periphery is known as

Answer 19

an aspheric lens

Question 20

How many diopters of power will bring parallel rays of incident light to focus at a distance of one meter?

Answer 20

one diopter

Question 21

In which of the following types of corneal astigmatism is a GP lens most indicated?

Answer 21

irregular

Question 22

Spherical equivalent powers position which of the following on the retina?

Answer 22

Circle of least confusion

Question 23

Keratoconus and penetrating keratoplasty fittings are best accomplished by which of the following methods?

Answer 23

diagnostic fitting

Question 24

The following ametropia frequently results in high riding rigid lenses

Answer 24

high myopia

Question 25

A soft toric lens will correct

Answer 25

Residual Astigmatism, Moderate Astigmatism, Low Astigmatism

Question 26

The FDA classification for disposable lenses means

Answer 26

The lens is disposed of after removal