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76 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the main function of the sclera?
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To protect the eye
Page 61 |
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The anterior chamber is located between the _____ and the ____. It is filled with ________ which originates from ________.
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The anterior chamber is located between the <iris> and the <cornea>. It is filled with <aqueous humor> which originates from <ciliary process>.
Page 66 |
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Where is the posterior chamber?
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Behind the crystalline lens.
Page 66 |
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Where is the pupil?
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It is in the middle layer of the eye. It is a hole in the center of the iris. In front of crystalline lens.
Page 61 |
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What is accommodation?
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When the ciliary muscles change the shape of the crystalline lens for viewing at various distances.
Page 61 |
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What causes the crystalline lens to change its power?
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The ciliary muscles.
Page 66 |
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What is a cataract?
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The condition when the crystalline lens loses its transparency and becomes opaque. It no longer allows light to pass through.
Page 80 |
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What is glaucoma?
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A medical condition related to increased intraocular pressure.
Page 68 |
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What is aphakia?
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An eye without a crystalline lens.
Page 80 |
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What is pseudoaphakia?
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An eye with an artificial crystalline lens.
Page 81 |
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What is presbyopia?
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When the crystalline lens loses its flexibility and accommodative power as a result of aging. Unable to see near.
Hyperopic more likely to get it before an emmetropic and lastly a myopic. Page 85 |
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What are the extrinsic muscles of the eye? What are the names of the rectus muscles? What are the name of the obliques?
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They are the muscles outside of the eye. The four rectus muscles are: lateral rectus, medial rectus, superior rectus, inferior rectus. The two oblique are: superior oblique and inferior oblique.
Page 66 |
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What is the limbus?
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The transition zone between the cornea and the sclera.
Page 61 |
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What is the power of the average cornea?
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+43.00 D
Page 61 |
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What are the three major parts of the eyes optical system?
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Cornea, crystalline lens, retina.
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What is the main refractive structure of the eye?
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The cornea.
Page 61 |
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What is the main focusing structure of the eye?
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The crystalline lens.
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A presbyopic patient _____.
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A presbyopic patient <requires addition of a plus lens to his or her prescription for seeing near>.
Page 85 |
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What is ametropia? What is emmetropia?
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Ametropia is an eye that has refractive error- parallel light does not focus on the retina.(hyperopia, myopia, astigmatism)
Emmetropia is an eye that has no refractive error. Page 69 |
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What are the characteristics of a plus lenses?
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-It is thickest at the center.
-Made up of two prisms base to base. -Optic center is at the base. -Focal point behind the lens. -Converges light. -Magnifies. -Creates real image -Corrects hyperopia. -Increases power as increasing distance from eye. -Against the motion. -Inverted image Page 33 & 34 |
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What are the characteristics of a minus lens?
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-Thickest at the edges.
-Base curve has longer radius than the ocular curve. -Made up of two prisms apex to apex. -Optic center at apex. -Virtual focal point in front of lens. -Diverges light. - Minifies. -Creates virtual image. -Corrects myopia. -Lengthens focal point to cornea. -With the motion. Page 35 & 36 |
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What does prism do?
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It deviates the light towards its base. It disperses the white light into component colors. It displaces the object towards its apex.
Page 101 |
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Calculate the focal lengths for the following lense: 2.00 D
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1 / 2 = 0.5m
40 / 2 = 20in 100 / 2 = 50cm 1000 / 2 = 500mm |
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Calculate the focal lengths for the following lens: 4.00 D
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1 / 4 =.25m
40 / 4 = 10in 100 / 4= 25cm 1000 / 4= 250mm |
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Calculate the focal lengths for the following lens: 10.00 D
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1 / 10 = 0.10m
40 / 10 = 4in 100 / 10 = 10cm 1000 / 10 = 100mm |
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Calculate the focal lengths for the following lens: 6.00 D
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1 / 6 = 0.166..m
40 / 6 = 6.66..in 100 / 6 = 16.66..cm 1000 / 6 = 166.66..mm |
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Calculate the focal lengths for the following lens: 12.00 D
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1 / 12 = 0.083..m
40/ 12 = 3.33..in 100 / 12 = 8.33..cm 1000 / 12 = 83.33..mm |
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Calculate the power of the following lens: 20"
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40 / 20 = 2.00 D
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Calculate the power of the following lens: 80".
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40 / 80 = 0.50 D
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Calculate the power of the following lens: 10".
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40 / 10 = 4.00 D
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Calculate the power of the following lens: 25cm.
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100 / 25 = 4.00 D
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Calculate the power of the following lens: 50cm.
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100 / 50 = 2.00 D
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Calculate the power of the following lens: 200cm.
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100 / 200 = 0.50 D
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Calculate the power of the following lens: 2m.
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1 / 2 = 0.50 D
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Calculate the power of the following lens: 0.25m.
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1 / 0.25 = 4.00 D
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Calculate the power of the following lens: 0.5m.
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1 / 0.5 = 2.00 D
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Calculate the power of the following lens: 1000mm.
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1000 / 1000 = 1.00 D
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Calculate the power of the following lens: 200mm.
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1000 / 200 = 5.00 D
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Calculate the power of the following lens: 100mm.
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1000 / 100 = 10.00 D
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Which of the following is the strongest lens: 4.00 D or 6.00 D?
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6.00 D
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Which of the following is the strongest lens: -4.00D or +3.00D?
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-4.00 D
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Which of the following is the strongest lens: FL of 20" or FL of 40"?
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FL of 20"
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Which of the following is the strongest lens: FL of 1m or FL 40"?
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They are equal.
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Determine the true power of the following lens:
-3.00-2.00x040 |
-3.00@040
-5.00@130 |
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Determine the true power of the following lens:
+4.00-4.00x095 |
+4.00@095
plano@005 |
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Determine the true power of the following lens:
-1.00+1.00x120 |
-1.00@120
plano@030 |
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Determine the true power of the following lens:
plano+1.00x010 |
plano@010
+1.00@100 |
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Determine the true power of the following lens:
-2.00+3.00x164 |
-2.00@164
+1.00@074 |
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Determine the true power of the following lens:
+0.50-0.25x160 |
+0.50@160
+0.25@070 |
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Determine the true power of the following lens:
+4.00+1.25x175 |
+4.00@175
+5.25@085 |
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Determine the true power of the following lens:
-4.50+2.25x085 |
-4.50@085
-2.25@175 |
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Determine the true power of the following lens:
-3.75+2.25x012 |
-3.75@012
-1.50@102 |
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Determine the true power of the following lens:
-6.50+1.25x065 |
-6.50@065
-5.25@155 |
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Determine the true power of the following lens:
-5.50-2.50x005 |
-5.50@005
-8.00@095 |
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Determine the true power of the following lens:
+6.75-1.75x032 |
+6.75@032
+5.00 |
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Write the Rx from the true powers:
(-9.00) (-10.25) @170 |
-9.00-1.25x170
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Write the Rx from the true powers:
(-6.75) (-5.75) @100 |
-6.75+1.00x100
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Write the Rx from the true powers:
(+2.25) (plano) @115 |
+2.25-2.25x115
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Write the Rx from the true powers:
-4.25@090 -5.50@180 |
-4.25-1.25x090
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Write the Rx from the true powers:
+4.00@145 -0.25@055 |
+4.00-4.25x145
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Write the Rx from the true powers:
plano@155 -1.00@045 |
plano-1.00x155
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Write the Rx from the true powers:
(-1.00) (-0.50) @180 |
-1.00+0.50x180
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Write the Rx from the true powers:
(-3.00) (-5.25) @075 |
-3.00-2.25x075
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Write the Rx from the true powers:
(+2.00) (-1.00) @110 |
+2.00-3.00x110
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Transpose the following Rx:
-2.25+0.75x145 |
-1.50-0.75x055
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Transpose the following Rx:
+1.50-0.25x006 |
+1.25+0.25x096
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Transpose the following Rx:
-0.75+1.00x090 |
+0.25-1.00x180
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Transpose the following Rx:
+6.75-2.00x111 |
+4.75+2.00x021
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Transpose the following Rx:
-9.50+2.25x180 |
-7.25-2.25x090
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Transpose the following Rx:
+4.75-1.75x120 |
+3.00+1.75x030
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What is the horizontal power of the following lens:
-2.00-1.00x090 |
-3.00@180
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What is the horizontal power of the following lens:
+2.50-1.75x180 |
+2.50@180
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What is the horizontal power of the following lens:
-0.75-1.00x045 |
-1.25@180
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What is the vertical power of the following lens:
-6.75-2.25x090 |
-6.75@090
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What is the vertical power of the following lens:
+5.50-2.25x180 |
+3.25@090
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What is the vertical power of the following lens:
+1.00+2.50x135 |
+2.25@090
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