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Optometry Board Practice Test for the NBEO® Part 1 Test #2 – Optics This test is comprised of 17 items. This is PRACTICE mode. There is no countdown timer and answers are shown after each question. |
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What is the refracting power of a 3X simple magnifier?
C. 12 D ; 3X=F/4 ; F=12D
C. 12 D ; 3X=F/4 ; F=12D
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.
D. 332X
D. 332X
Out of the following statements, select the one answer that is NOT true regarding telescopes.
C.
C.
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 ; Fobj=440mm Feye=44mm ; M=-440/44=-10X
A. -10X ; Fobj=440mm Feye=44mm ; M=-440/44=-10X
A patient requires a prescription of +6.00 D in contacts. What power is needed at a vertex distance of 14 mm?
D. +5.50 D
D. +5.50 D
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 ; (0.07/6)(8.73)(20/20)= 10.18mm
A. 10.18mm ; (0.07/6)(8.73)(20/20)= 10.18mm
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?
D. 20/500 ; (10/8)(400)=500
D. 20/500 ; (10/8)(400)=500
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?
D. 48.75 cm +40X
D. 48.75 cm +40X
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
C. 867 mm
C. 867 mm
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?
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.
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.
When evaluating an RGP fit, the following is true:
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.
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.
All of the following can cause poor vision in an RGP wearer except:
C. poor wetting provides uncomfortable fit for the patient but has minimal effect on vision compared to the other choices
C. poor wetting provides uncomfortable fit for the patient but has minimal effect on vision compared to the other choices
Which of the following has the greatest effect on flattening a contact lens?
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.
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.
Fitting steeper than K:
B. creates a positive tear lens.
B. creates a positive tear lens.
All of the following can increase the amount of oxygen reaching the cornea EXCEPT:
C. Decreasing edge lift will cause a decrease in oxygen not increase oxygen.
C. Decreasing edge lift will cause a decrease in oxygen not increase oxygen.
The peripheral curve radius can be measured with:
A. Toposcope
A. Toposcope
Decreasing diameter:
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
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