Optics

NBEO® Part 1 Full Length Test #2 - Optics

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Optometry Board Practice Test for the NBEO^® Part 1

Test #2 – Optics

This test is comprised of 17 items, which must be completed within 17 minutes.

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Optics: Contact Lenses 0%
Optics: Low Vision 0%

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Question 1 of 17

1. Question
What is the refracting power of a 3X simple magnifier?
- A. 10D
- B. 11D
- C. 12D
- D. 13D
Correct

C. 12 D ; 3X=F/4 ; F=12D

Incorrect

C. 12 D ; 3X=F/4 ; F=12D
Question 2 of 17

2. Question
A microscope has a 6mm focal length objective and 16mm focal length ocular lens. The separation between the two lenses is 150mm. Calculate the Total angular magnification of the microscope.
- A. 21.3X
- B. 15X
- C. 400X
- D. 332X
Correct

D. 332X

Incorrect

D. 332X
Question 3 of 17

3. Question
The focal length of the objective lens of a telescope is 440mm. The focal length of the ocular lens is 44mm. What is the magnification of the telescope?
- A. -10X
- B. +10X
- C. -0.10X
- D. +0.10X
Correct

A. -10X ; Fobj=440mm Feye=44mm ; M=-440/44=-10X

Incorrect

A. -10X ; Fobj=440mm Feye=44mm ; M=-440/44=-10X
Question 4 of 17

4. Question
Out of the following statements, select the one answer that is NOT true regarding telescopes.
- A. In a Galilean telescope the entrance pupil is a virtual image of the pupil.
- B. In a Galilean telescope the exit pupil is the eye/ocular lens
- C. In a Keplerian telescope the entrance pupil is equal to half the diameter of the objective lens.
- D. In the Keplerian telescope the exit pupil is a real inverted image of the objective lens.
- E. The aperture stop in both types of telescopes is the objective lens.
- F. The field stop in both types of telescopes is the ocular lens.
Correct

C.

Incorrect

C.
Question 5 of 17

5. Question
A patient requires a prescription of +6.00 D in contacts. What power is needed at a vertex distance of 14 mm?
- A. +6.50 D
- B. +7.00 D
- C. +5.00 D
- D. +5.50 D
- E. +6.00 D
Correct

D. +5.50 D

Incorrect

D. +5.50 D
Question 6 of 17

6. Question
A patient is able to read the 20/20 line at 7 cm. What is the size of that letter that the patient is able to read?
- A. 10.18mm
- B. 14.25 mm
- C. 8.33 mm
- D. 7.14mm
Correct

A. 10.18mm ; (0.07/6)(8.73)(20/20)= 10.18mm

Incorrect

A. 10.18mm ; (0.07/6)(8.73)(20/20)= 10.18mm
Question 7 of 17

7. Question
A doctor has reduced the size of a chart to work at 10 feet. The patient needs to be brought to 8 feet to see the 20/400 line. What is the VA of the patient?
- A. 20/100
- B. 20/30
- C. 20/800
- D. 20/500
Correct

D. 20/500 ; (10/8)(400)=500

Incorrect

D. 20/500 ; (10/8)(400)=500
Question 8 of 17

8. Question
Using a Galilean telescope of +2.00D objective and -80D ocular lens, what is the tube length required to make this telescope function? What is the magnification?
- A. 52.25 cm +40X
- B. 45.50cm +40 X
- C. 50.00 cm -40X
- D. 48.75 cm +40X
Correct

D. 48.75 cm +40X

Incorrect

D. 48.75 cm +40X
Question 9 of 17

9. Question
Given an entrance pupil with diameter 75 mm and exit pupil diameter 6.3 mm, what is the total length of the a keplerian telescope which has an objective +1.25D lens
- A. 872 mm
- B. 853 mm
- C. 867 mm
- D. 881 mm
Correct

C. 867 mm

Incorrect

C. 867 mm
Question 10 of 17

10. Question
Which of the following lenses should be chosen to achieve the same optical correction of a lens with BCR of 7.58 and a power of +2.00D?
- A. 7.67/+1.50
- B. 7.67/+2.50
- C. 7.50/+2.25
- D. 7.50/+2.50
Correct

B. 7.67/+2.50. Index of refraction of most contact lens is 1.3375. To find the power of the cornea we use the equation (n-1/r)1000. (1.3375-1/7.58)1000=44.52. The answer choices that have a BCR of 7.50 we would need a compensation power of 1.50 in order to provide an adequate fit with no over refraction. For a BCR of 7.67 we would need a compensation power of 2.50 in order to provide an adequate fit with no over refraction.

Incorrect

B. 7.67/+2.50. Index of refraction of most contact lens is 1.3375. To find the power of the cornea we use the equation (n-1/r)1000. (1.3375-1/7.58)1000=44.52. The answer choices that have a BCR of 7.50 we would need a compensation power of 1.50 in order to provide an adequate fit with no over refraction. For a BCR of 7.67 we would need a compensation power of 2.50 in order to provide an adequate fit with no over refraction.
Question 11 of 17

11. Question
When evaluating an RGP fit, the following is true:
- A. The center of the lens needs to have greater distance between the back of the lens and the cornea at the periphery
- B. In the midperiphery, the lens should be somewhat closer to the eye
- C. A green rim of fluorescein on the periphery means the lens is not lifting so as to have good tear reservoir
- D. The area that will touch first on the WTR cornea will be the vertical meridian
Correct

B. the mid periphery the lens must be closer to the eye then other parts of the lens in order to provide an ideal seal and lacrimal lens power for the patient.

Incorrect

B. the mid periphery the lens must be closer to the eye then other parts of the lens in order to provide an ideal seal and lacrimal lens power for the patient.
Question 12 of 17

12. Question
All of the following can cause poor vision in an RGP wearer except:
- A. Lens flexure
- B. Lens warpage
- C. Poor wetting
- D. Excessive edge lift
Correct

C. poor wetting provides uncomfortable fit for the patient but has minimal effect on vision compared to the other choices

Incorrect

C. poor wetting provides uncomfortable fit for the patient but has minimal effect on vision compared to the other choices
Question 13 of 17

13. Question
Which of the following has the greatest effect on flattening a contact lens?
- A. Increase OAD and increase the BC (mm)
- B. Increase OAD and decrease the BC (mm)
- C. Decrease the OAD and decrease the BC (mm)
- D. Decrease the OAD and increase the BC (mm)
Correct

D. Decrease the OAD and increase the BC. Imagine the contact lens like a suction cup. The taller the cup the more it will not move and vice versa. In order to decrease the “height” of the suction cup and make it flatter we must cut or decrease the diameter. Increasing the BC can also cause the contact lens to be flatten.

Incorrect

D. Decrease the OAD and increase the BC. Imagine the contact lens like a suction cup. The taller the cup the more it will not move and vice versa. In order to decrease the “height” of the suction cup and make it flatter we must cut or decrease the diameter. Increasing the BC can also cause the contact lens to be flatten.
Question 14 of 17

14. Question
Fitting steeper than K:
- A. Creates a negative tear lens
- B. Creates a positive tear lens
- C. Results in more plus power acceptance
- D. Can result in an evenly distributed fluorescein pattern in the periphery
Correct

B. creates a positive tear lens.

Incorrect

B. creates a positive tear lens.
Question 15 of 17

15. Question
All of the following can increase the amount of oxygen reaching the cornea EXCEPT:
- A. Fenestrations
- B. Blending
- C. Decreasing edge lift
- D. Bicurve lenses
Correct

C. Decreasing edge lift will cause a decrease in oxygen not increase oxygen.

Incorrect

C. Decreasing edge lift will cause a decrease in oxygen not increase oxygen.
Question 16 of 17

16. Question
The peripheral curve radius can be measured with:
- A. Toposcope
- B. Keratometer
- C. Measuring magnifier
- D. Stereomicroscope
Correct

A. Toposcope

Incorrect

A. Toposcope
Question 17 of 17

17. Question
Decreasing diameter:
- A. Decreases lens movement
- B. Can lessen edema
- C. Makes the lens steeper
- D. Can cause a low riding lens
Correct

B. can lessen edema. When we decrease diameter there is less surface area covering the cornea as well as having a flatter contact lens. This can increase the movement of the lens

Incorrect

B. can lessen edema. When we decrease diameter there is less surface area covering the cornea as well as having a flatter contact lens. This can increase the movement of the lens

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