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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
Q

Trichasis

A

The condition in which the lashes turn inward toward the eye

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26
Q

What modification cannot be performed on a contact lens ?

A

Steepen peripheral curves

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27
Q

What is an example of With-The-Rule Astigmatism ?

A

44.00 @ 90 / 42.00 @ 180

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28
Q

An advantage of a minus carrier lenticular lens is that it

A

Enables the lid to keep the lens in position

29
Q

The Base curve of a RGP lens is best checked using a

A

Radiuscope

30
Q

When checking the CPC of a lens tolerance should be

A

.025mm

31
Q

Secretions from the ____________ from the oily layer of the pre corneal film

A

Meibomian Gland

32
Q

A patient is fitted with a rigid lens of 9.0mm diameter. If you decrease the diameter to 8.5 mm you will

A

Create a flatter lens/corneal relationship

33
Q

A patient is fitted with a rigid lens of 9.0 mm diameter. If you decrease the diameter to 8.5 you will ?

A

Make the lens flatter. ( Decrease Lens diameter = looser lens)

34
Q

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.

A

Increase the radius of curvature of the lens. This loosens the lens so its not so tight.

35
Q

When trial lens fitting a soft lens patient, after placing the lens on the eye you should?

A

Allow the lens to settle 20 minutes before evaluation.

36
Q

Before using any keratometer, it is necessary to:

A

Focus the eyepiece

37
Q

______________ Soft lens deposits do the most damage to the lens surface ?

A

Calcium Carbonate

38
Q

A concern with the use of extended wear lenses is:

A

Polymegathism: which is a variation in cell size within the endothelial monolayer

39
Q

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:

A

corneal dehydration.

40
Q

The DK value of the lens is

A

Oxygen Permeability of that material

41
Q

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.

A

Steep

42
Q

The tolerance of the anterior optic zone diameter of corneal contact lens ( ANSI Z80.2 1972 R 1978) is:

A

+.10mm

43
Q

A mosaic pattern is observed on the cornea with fluorescein. A possible cause might be:

A

Rubbing Eyelids

44
Q

The Most common illumination used to check for rigid lens edema is:

A

Sclerotic scatter

45
Q

What instrument is used to measure the optical zone of a contact lens ?

A

measuring magnifier

46
Q

The average index of refraction of the cornea is:

A

1.373

47
Q

When checking the base curve of a contact lens, the tolerance should be:

A

-/+ 0.02mm

48
Q

The best method to fit an individual with keratoconus is with a

A

Trail lens evaluation

49
Q

The advantage of a plus lenticular lens is that it

A

Allows a high minus lens to ride lower

50
Q

The purpose of the topogometer is to

A

Measure the diameter of the apex of the cornea

51
Q

Orthokeratology may be defined as:

A

Reduction of the refractive errors by corneal molding with a contact lens applications.

52
Q

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?

A

Decrease the diameter

53
Q

The process by which the cornea maintains itself in its partially dehydrated state is known as

A

deturgescense

54
Q

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.

A

Sorbic acid preserved solution

55
Q

___________ can be used to evaluate the proper blend of an RGP lens ?

A

Fluorescent Tubes

56
Q

Lens power must be adjusted for vertex over ______________ diopter

A

+4.00 D

57
Q

The tolerance of the posterior secondary intermediate or peripheral curve radius (ANSI Z80.2 1972 R 1978) is

A

-/+ .10mm

58
Q

A possible problem which may result from using cold chemical disinfection might be:

A

Chemical Conjunctivitis

59
Q

The ophthalmoscope is used to

A

Illuminate and inspect the interior of the eye

60
Q

The junction of the cornea and sclera is known as the

A

Limbus

61
Q

The index of the crystalline lens is:

A

1.427

62
Q

The index of the cornea is

A

1.337

63
Q

Ciliary Processes (body)

A

Responsible for the major production of aqueous fluid. The Zonules of Zinn ( Zonule Fibers) attach to this.

64
Q

Aqueous Humor

A

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
Q

Tonometry

A

The test used to evaluate the fluid pressure within the eye

66
Q

Sclera

A

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
Q

Palpebral Fissure

A

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
Q

Mucoid Layer

A

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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