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NCLE FLASH CARDS TYPE C > Contact Lens Terms > Flashcards

Contact Lens Terms Flashcards

1
Q

Cones

A

The cell in the retina that are responsible for fine detail and color vision.

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2
Q

Asthenopia

A

Eye fatigue caused by tiring of the internal and/or external eye muscles.

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3
Q

Zonules of Zinn

A

The suspensory ligaments connecting the crystalline lens and the ciliary body (AKA Zonula Fibers)

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4
Q

Ptosis Crutch

A

A device attached to the back eye wire of a frame for the purpose of supporting a drooping eyelid

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5
Q

Subconjunctival Hemorrhage

A

A blood-red spot on the sclera due to ruptured conjunctival blood vessels.

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6
Q

NCT (Non-Contact-Tonometer)

A

A screen instrument that emits a puff of air to check the intraocular pressure of the eye

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7
Q

Lipid Layer

A

The outer, oily layer of tears produced by the meibomuim glands located in the lids. The function is to decrease tear evaporation and to provide a smooth refractive surface to the front of the cornea.

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8
Q

IOP (Intraocular Pressure)

A

The amount of fluid pressure in an eye

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9
Q

Canal of Schlemm

A

A circular channel located at the junction of the sclera and the cornea through which aqueous is excreted, after it has circulated around the lens, the iris, and the cornea.

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10
Q

Dural Sheath

A

The outer cover of the optic nerve

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11
Q

Cornea

A

A clear, transparent structure at the front of the globe that serves as the primary refractive surface of the eye. It is avascular (contains no blood vessels) and must get nourishment from air and tears.

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12
Q

Limbus

A

The junction between the sclera and the cornea.

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13
Q

Pterygium

A

A triangular wedge shaped thickening of the conjunctiva that has encroached on the cornea. Pterygium can interfere with sight.

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14
Q

Rods

A

Straight, slender structures which are highly sensitive to light but not to detail of color. They function best in the dim light and are distributed in all but the central area of the retina.

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15
Q

Vitreous Humor

A

The jelly-like structure of the globe that fills the largest space of the eye, occupying 2/3 of the eyes volume.

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16
Q

Asymptomatic

A

Showing no Symptoms

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17
Q

Corneal Ulcers

A

Erosion of the cornea by bacteria injury or disease. An extremely painful condition which causes most people to feel like they have a large foreign body in their eyes.

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18
Q

Extended Wear Contact Lenses

A

Soft or gas permeable lenses that can be used for overnight wear due to high oxygen transmission through the lens.

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19
Q

Lamina Cribosa

A

The fibrous sleeve-like structure through which the optic nerve fibers leave the globe

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20
Q

That is OS when referring to the left for right eye

A

Oculus Sinister (left Eye)

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21
Q

Accommodation (Near Reflex)

A

Three actions that occur in the eyes when viewing an object up close:

  1. Pupil Constricts
  2. Crystalline Lens Flex
  3. Convergence ( eyes move to focus light on fovea)
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22
Q

Prebyopia

A

The gradual loss of accommodative ability due to the aging of the crystalline lens

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23
Q

Retina

A

The nerve layer that line the back of the eye, the Retina senses light and creates impulses that are sent through the optic nerve to the brain.

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24
Q

Scotoma

A

Refers to an area of reduced sensitivity or loss of vision in the visual field. Looks like a blurring at certain point of you vision.

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25
Trichasis
The condition in which the lashes turn inward toward the eye
26
What modification cannot be performed on a contact lens ?
Steepen peripheral curves
27
What is an example of With-The-Rule Astigmatism ?
44.00 @ 90 / 42.00 @ 180
28
An advantage of a minus carrier lenticular lens is that it
Enables the lid to keep the lens in position
29
The Base curve of a RGP lens is best checked using a
Radiuscope
30
When checking the CPC of a lens tolerance should be
.025mm
31
Secretions from the ____________ from the oily layer of the pre corneal film
Meibomian Gland
32
A patient is fitted with a rigid lens of 9.0mm diameter. If you decrease the diameter to 8.5 mm you will
Create a flatter lens/corneal relationship
33
A patient is fitted with a rigid lens of 9.0 mm diameter. If you decrease the diameter to 8.5 you will ?
Make the lens flatter. ( Decrease Lens diameter = looser lens)
34
Your Patient returns for a follow up with soft lenses. After removing the lenses, you observe cornea indentation. To correct this, you decide to ________________ of the lens.
Increase the radius of curvature of the lens. This loosens the lens so its not so tight.
35
When trial lens fitting a soft lens patient, after placing the lens on the eye you should?
Allow the lens to settle 20 minutes before evaluation.
36
Before using any keratometer, it is necessary to:
Focus the eyepiece
37
______________ Soft lens deposits do the most damage to the lens surface ?
Calcium Carbonate
38
A concern with the use of extended wear lenses is:
Polymegathism: which is a variation in cell size within the endothelial monolayer
39
A patient returns for the follow-up care with a rhino-virus and is taking an over the counter decongestant/antihistamine. A possible effect is:
corneal dehydration.
40
The DK value of the lens is
Oxygen Permeability of that material
41
A lens which shows a darker concentration of flourascien dye in the center of the lens but gets lighter in intensity as it approaches the periphery of the lens might be fitting.
Steep
42
The tolerance of the anterior optic zone diameter of corneal contact lens ( ANSI Z80.2 1972 R 1978) is:
+.10mm
43
A mosaic pattern is observed on the cornea with fluorescein. A possible cause might be:
Rubbing Eyelids
44
The Most common illumination used to check for rigid lens edema is:
Sclerotic scatter
45
What instrument is used to measure the optical zone of a contact lens ?
measuring magnifier
46
The average index of refraction of the cornea is:
1.373
47
When checking the base curve of a contact lens, the tolerance should be:
-/+ 0.02mm
48
The best method to fit an individual with keratoconus is with a
Trail lens evaluation
49
The advantage of a plus lenticular lens is that it
Allows a high minus lens to ride lower
50
The purpose of the topogometer is to
Measure the diameter of the apex of the cornea
51
Orthokeratology may be defined as:
Reduction of the refractive errors by corneal molding with a contact lens applications.
52
If the diameter of a RGP lens is 9.2 mm and is fitting too steep on the cornea, what adjustment could be made to the lens?
Decrease the diameter
53
The process by which the cornea maintains itself in its partially dehydrated state is known as
deturgescense
54
Your patient returns for a follow up after two months of wearing soft (daily) lenses of greater than 55% water content. You observe brown discoloration to the lens. You decide the problem might be.
Sorbic acid preserved solution
55
___________ can be used to evaluate the proper blend of an RGP lens ?
Fluorescent Tubes
56
Lens power must be adjusted for vertex over ______________ diopter
+4.00 D
57
The tolerance of the posterior secondary intermediate or peripheral curve radius (ANSI Z80.2 1972 R 1978) is
-/+ .10mm
58
A possible problem which may result from using cold chemical disinfection might be:
Chemical Conjunctivitis
59
The ophthalmoscope is used to
Illuminate and inspect the interior of the eye
60
The junction of the cornea and sclera is known as the
Limbus
61
The index of the crystalline lens is:
1.427
62
The index of the cornea is
1.337
63
Ciliary Processes (body)
Responsible for the major production of aqueous fluid. The Zonules of Zinn ( Zonule Fibers) attach to this.
64
Aqueous Humor
The clear watery fluid which fills the anterior and posterior chambers within the front part of the eye. It provides nutrients too the lens, removes waste maintains intaocular pressure and is refractive medium of the eye.
65
Tonometry
The test used to evaluate the fluid pressure within the eye
66
Sclera
The white portion of the outer layer of the eye that forms the major part of the protective coat of the eye. it is vascular (contains blood vessels)
67
Palpebral Fissure
The entrance into the conjunctival sac that is bounded by margins of the two lids. Commonly referred to as the opening of the eye.
68
Mucoid Layer
The inner mucus later of tears produced by the goblet cells in the conjunctiva. The function allows the tears to adhere to and coat the eye.

NCLE FLASH CARDS TYPE C (1 decks)

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