FREE NBEO Applied Basic Science Questions and Answers

Question 1

A +7.00 D lens has a real object located 20 cm from the lens. The conjugate image is:

Accepted Answer

real and located 50 cm from the lens

Answer

virtual and located 50 cm from the lens

Answer

real and located 8.30 cm from the lens

Answer

virtual and located 8.30 cm from the lens

Answer

real and located 14.30 cm from the lens

Question 2

A lens is made of glass with a refractive index of 1.65. What would be the refractive index for the ideal anti-reflection coating?

Accepted Answer

1.28

Answer

1.34

Answer

1.41

Answer

1.49

Answer

1.65

Question 3

An eye under the influence of an extremely strong miotic agent has a pupil diameter of 1 mm. The resolution of this eye is considered to be limited by:

Accepted Answer

diffraction

Answer

radial astigmatism

Answer

coma

Answer

spherical aberration

Answer

depth of focus

Question 4

The Jackson crossed cylinder subjective test begins with a -1.00 -1.75 x 090 lens in front of a patient's eye. If the correcting cylinder power is changed to -0.75 x 090, then the spherical power should now be:

Accepted Answer

-1.50 DS

Answer

-2.00 DS

Answer

-1.00 DS

Answer

-0.50 DS

Answer

+0.50 DS

Question 5

A 53-year-old male complains of occasional blur at a distance and near. His visual acuities are 20/30 in each eye at distance and near with his present lens correction of +1.00 DS OU,  Add +1.75 D. Your distance refraction for 20/20+  acuity is +1.50 DS OU. The BEST  tentative Add for the new prescription will have the power of:

Accepted Answer

+1.75 D

Answer

+1.25 D

Answer

+2.25 D

Answer

+2.50 D

Question 6

A 21-year-old patient has a history of previously uncorrected simply hyperopic astigmatism of 3.00 D in each eye. Which of the following is MOST likely to be associated with the patient's refractive error?

Accepted Answer

Meridional amblyopia in both eyes

Answer

Eccentric fixation in one or both eyes

Answer

Monocular central suppression

Answer

Anomalous correspondence

Answer

Strabismus secondary to the uncorrected refractive error

Question 7

In diabetic patients, a relative increase in which of the following refractive conditions is  MOST associated with an increase in serum glucose levels?

Accepted Answer

Myopia

Answer

Hyperopia

Answer

Astigmatism

Answer

Anisometropia

Question 8

A patient's corneal topography map shows steepening of the vertical meridian in a "bow-tie"  pattern. This indicates that the patient has:

Accepted Answer

with-the-rule astigmatism

Answer

against-the-rule astigmatism

Answer

irregular astigmatism

Answer

a spherical cornea

Question 9

A head tilt toward the left shoulder is MOST likely due to a paresis of the right:

Accepted Answer

superior oblique

Answer

inferior oblique

Answer

inferior rectus

Answer

superior rectus

Question 10

The near point of accommodation (NPA) of a patient wearing a +1.25 D Add over his best distance correction is 19 cm. If the Add is removed, the NPA would then be at approximately:

Accepted Answer

25 cm

Answer

15 cm

Answer

20 cm

Answer

30 cm

A +7.00 D lens has a real object located 20 cm from the lens.The conjugate image is:

A +7.00 D lens has a real object located 20 cm from the lens.
The conjugate image is: