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optics 4 - quiz 1 > Ametropia > Flashcards

Ametropia Flashcards

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1
Q

The anterior focal point is 15mm in front of the principal plane of a refractive ametrope’s eye. What is the patient’s ocular refractive error?

a. Hyperope, 6.67D
b. Hyperope, 7.78D
c. Myope, 4.86D
d. Myope, 6.67D
e. Myope, 7.78D

A

Myope, 6.67D

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2
Q

The far point of an axial ametrope is located 15cm in front of the eye’s principal plane. Assume that the spectacle plane is 15mm in front of the eye’s principal plane. What would be power of the spectacle lens required to correct the eye for infinity?

a. –6.67D
b. +6.06D
c. –6.06D
d. –8.53D
e. –7.41D

A

e. –7.41D

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3
Q

What would be the distance between the principal plane and retina for a 9D axial myope?

a. 26.14mm
b. 22.22mm
c. 19.32mm
d. 25.55mm
e. 28.01mm

A

a. 26.14mm

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4
Q

What would be the distance between the principal plane and retina for a 9D axial hyperope?

a. 26.14mm
b. 22.22mm
c. 19.32mm
d. 25.55mm
e. 28.01mm

A

c. 19.32mm

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5
Q

Which of the following changes in isolation would cause an emmetropic eye to become myopic?

a. an increase in the refractive index of the vitreous
b. a decrease in the depth of the anterior chamber
c. an increase in the radius of curvature of the anterior corneal surface
d. a decrease in the refractive index of the aqueous humor
e. an increase in the refractive index of the cornea.

A

a decrease in the depth of the anterior chamber

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6
Q

For an axial ametrope, the distance between the nodal point and the retina is 24mm. What is the eye’s ocular refractive correction (CL Rx)?

a. –14.88D
b. –8.88D
c. –4.44D
d. –12.27D
e. +12.27D

A

a. –14.88D

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7
Q

The anterior (primary) focal length of a refractive ametropic eye is –14mm. What is the eye’s ocular refractive correction (CL Rx)?

a. –35.23 D
b. –11.43 D
c. –22.68 D
d. –7.39 D
e. –9.77 D

A

b. –11.43 D

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8
Q

The secondary focal length of a refractive ametrope is 21 mm. What is the eye’s ocular refractive error?

a. +6.34 D
b. +12.38 D
c. +3.49 D
d. +2.59 D
e. +1.98 D

A

c. +3.49 D

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9
Q

A myopic patient has a +5D ocular refractive error. Where does a –10D lens have to be placed to create the proper distance correction? Assume that the patient does not accommodate.

a. 20 mm in front of the eye’s principal plane
b. 40 mm in front of the eye’s principal plane
c. 60 mm in front of the eye’s principal plane
d. 80 mm in front of the eye’s principal plane
e. 100 mm in front of the eye’s principal plane

A

e. 100 mm in front of the eye’s principal plane

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10
Q

The eye’s near point is _________________

a. the point conjugate to the retina when the eye is uncorrected but fully accommodated.
b. the point conjugate to the retina when the eye is corrected for distance and fully accommodated.
c. always located between optical infinity and the eye’s principal plane.
d. always physically closer to the eye’s principal plane than the eye’s far point.

A

a. the point conjugate to the retina when the eye is uncorrected but fully accommodated.

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11
Q 
You are performing distance Retinoscopy at a working distance of 50cm.  No working lenses are in place, +2.50 neutralizes the 180 meridian and +3.75 neutralizes the 90 meridian, what is Rx?
	a.  +0.50 + 1.25 x 180
	b.  +1.75 -1.25 x 90  
	c  +1.75 -1.25 x 180  
	d.  +3.75 -2.50 x 180
	e.  +3.75 -2.50 x 90
A

b. +1.75 -1.25 x 90

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12
Q 
You are performing distance Retinoscopy with no lenses in place.  The streak is vertical and neutralized motion is seen at a distance of 50cm.  Then the streak is held horizontally and neutralized motion is seen at a distance 25cm.   What is the Rx?
a.  -2.00 - 2.00 x 180
	b.  +2.00 -2.00 x 090  
	c   Plano -4.00 x 180  
	d.  Plano -4.00 x 090 
	e.  -2.00 + 2.00 x 90
A

a. -2.00 - 2.00 x 180

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13
Q

You are performing near retinoscopy and the patient is looking at your scope 40cm away. You use +0.75 to neutralize the motion. How much is the patient accommodating?

a. 2.50D
b. 3.00D
c. 1.75D
d. 1.00D
e. 1.50D
A

c. 1.75D

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14
Q

The farthest away (FP) a patient can see without accommodation is 50cm while wearing a -1.00 lens. What is their refractive error?

a. 2.00D Myope
b. 3.00D Myope
c. 1.00D Hyperope
d. 1.00D Myope
e. 2.00D Hyperope
A

b. 3.00D Myope

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15
Q

The nearest point (NP) an emmetropic patient can see with full accommodation through a -2.00 lens is 20cm. What is their accommodation?

a. 0.00D 
b. 1.00D 
c. 3.00D 
d. 5.00D 
e. 7.00D
A

e. 7.00D

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16
Q

The nearest point (NP) a 3.00D myope can using full accommodation through an old pair of -2.00 lenses is 20cm. What is their accommodation?

a. 1.00D 
b. 2.00D 
c. 3.00D 
d. 4.00D 
e. 5.00D
A

d. 4.00D

17
Q

The far point for a patient looking through a +4.00 lens is 33cm, what is this patient’s refractive correction?

a. +1.00D 
b. 2.00D 
c. 3.00D 
d. 4.00D 
e. 5.00D
A

a. +1.00D

18
Q

A Bichrome (Red Green) test is performed on a fully corrected patient while fogged, what do they report?

a. Letters on the Red half of the eye chart appear clearer
b. Letters on the Green half of the eye chart appear clearer
c. Both letters on the red and green halves appear equally clear since fully corrected
d. Both letters on the red and green halves appear equally blurry since fully corrected and fogged

A

a. Letters on the Red half of the eye chart appear clearer

19
Q

A Bichrome (Red Green) test is performed on a fully corrected patient while over minused what do they report?

a. Letters on the Red half of the eye chart appear clearer
b. Letters on the Green half of the eye chart appear clearer
c. Both letters on the red and green halves appear equally clear since fully corrected
d. Both letters on the red and green halves appear equally blurry since fully corrected and fogged

A

b. Letters on the Green half of the eye chart appear clearer

20
Q

A Bichrome (Red Green) test is performed on an uncorrected myope what do they report?

a. Letters on the Red half of the eye chart appear clearer
b. Letters on the Green half of the eye chart appear clearer
c. Both letters on the red and green halves appear equally clear since fully corrected
d. Both letters on the red and green halves appear equally blurry since fully corrected and fogged

A

a. Letters on the Red half of the eye chart appear clearer

21
Q

A Bichrome (Red Green) test is performed on an uncorrected hyperope with (ageing accommodation) what do they report?

a. Letters on the Red half of the eye chart appear clearer
b. Letters on the Green half of the eye chart appear clearer
c. Both letters on the red and green halves appear equally clear since fully corrected
d. Both letters on the red and green halves appear equally blurry since fully corrected and fogged

A

b. Letters on the Green half of the eye chart appear clearer

22
Q

What is the mechanism involved in the use of bifocals for slowing myopia progression?
a. It prevents over-accommodation which is believed to precede myopia progression

A

a. It prevents over-accommodation which is believed to precede myopia progression

23
Q

In general, what was the purpose of using eye drops to slow the progression of myopia?
a. It prevents over-accomodation which is thought to precede myopia progression

A

a. It prevents over-accomodation which is thought to precede myopia progression

optics 4 - quiz 1 (9 decks)

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