2501 Flashcards by Leah Rose

IN ORDER TO EFFECT A SMOOTH BLEND ON A CONTACT LENS WHICH HAS A 10.50mm PPC,AND A 7.50mm CPC, ONE WOULD USE WHICH OF THE FOLLOWING TOOLS(WITH .4MM SOFT PAD)?

10mm
40mm
00mm
60mm

8.60mm

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IF THE MIRES OF A RADIUSCOPE ARE NOT IN FOCUS IN ALL MERIDIANS IT INDICATES:

POOR BLENDS

POOR EDGE

EXCESSIVE THICKNESS

WARPAGE

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WHICH OF THE FOLLOWING MODIFICATIONS CANNOT BE PERFORMED ON A RIGID CONTACT LENS?

STEEPEN PERIPHERAL CURVES

FLATTEN SECONDARY CURVE

REDUCE OPTICAL ZONE DIAMETER

BLEND TRANSITION ZONE

STEEPEN PERIPHERAL CURVES

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NAME AN ADJUSTMENT THAT USUALLY REQUIRES A NEW LENS.

REMAKING THE PERIPHERAL CURVE

REDUCING THE OPTICAL ZONE

CHANGING THE BASE CURVE

REDUCING THE DIAMETER

CHANGING THE BASE CURVE

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THE ANSI TOLERANCE FOR CONTACT LENS THICKNESS IS:

.05mm

.2mm

.5mm

.02mm

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ALL CONTACT LENS MODIFICATIONS TEND TO _____ THE LENS FIT.

HAVE NO EFFECT ON

DESTROY

LOOSEN

TIGHTEN

LOOSEN

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A MARCO RADIUSCOPE MEASURES THE BASE CURVE OF A LENS IN INCREMENTS OF:

20mm
01mm
002mm

O.12 DIOPTERS

0.01mm

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WHICH OF THE FOLLOWING POLISHING COMPOUNDS SHOULD NOT BE USED WITH GAS PERMEABLE LENSES?

SILVO

X PAL

SIL O2 CARE

ALOX PG

SILVO

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THE DIAMETER OF A RIGID CONTACT LENS CAN BE REDUCED BY ALL OF THE FOLLOWING EXCEPT:

FILE TECHNIQUE

PITCH TECHNIQUE

RAZOR BLADE TECHNIQUE

CONICAL STONE

PITCH TECHNIQUE

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THE DIOPTRIC POWER OF A LENS IS MEASURED BY A________.

SPHEROMETER

OPHTHALMOMETER

LENSMETER

RADIUSCOPE

LENSMETER

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WHICH OF THE FOLLOWING DISINFECTING SOLUTIONS WOULD YOU RECOMEND TO A PATIENT WITH A HISTORY OF ALLERGIC REACTIONS?

CHLORHEXDINE

THIMEROSAL

QUATERNARY AMMONIUM

HYDROGEN PEROXIDE

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INGREDIENTS ADDED TO CONTACT LENS SOLUTIONS TO PROTECT THEM FROM SPOILAGE AFTER BEING OPENED ARE CALLED:

DISINFECTANTS

CHELATING AGENTS

PRESERVATIVES

BUFFERING AGENTS

PRESERVATIVES

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UPON DELIVERY THE WEARER SHOULD BE TOLD:

THAT RIGID LENSES SHOULD BE POLISHED EVERY THREE MONTHS.

THAT FOLLOW-UP VISITS WILL NOT BE NECESSARY

TO REMOVE A LENS WHICH BECOMES UNCOMFORTABLE

THAT LENSES WILL LAST INDEFINITELY

TO REMOVE A LENS WHICH BECOMES UNCOMFORTABLE

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WHICH TYPE OF SALINE CAUSES THE LEAST PROBLEMS?

UNIT DOSE NON-PRESERVED*

SALT TABLETS

SORBIC ACID PRESERVED

THIMEROSAL PRESERVED

UNIT DOSE NON-PRESERVED*

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WHICH OF THE FOLLOWING CARE SYSTEMS WOULD RESULT IN THE SHORTEST LIFE FOR A SOFT LENS?

COLD CHEMICAL

HYDROGEN PEROXIDE

HEAT

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STUDIES HAVE SHOWN THAT AS HIGH AS ____% OF COMPLIANT CONTACT LENS PATIENTS HAVE CONTACT LENS CASES THAT CULTURE POSITIVE.

42%

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ALL OF THE FOLLOWING ARE FUNCTIONS OF A SOAKING SOLUTION EXCEPT:

IT DISSOLVES EXCESS SILICONE MOLECULES

IT MAINTAINS A STATE OF HYDRATED EQULIBRIUM

IT AIDS IN CLEANING THE LENS OF OCULAR SECREATIONS

IT PREVENTS EYE INFECTIONS BY A CONTAMINATED LENS

IT DISSOLVES EXCESS SILICONE MOLECULES

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WHY SHOULDN’T DIFFERENT BRANDS OF SOFT CONTACT LENS SOLUTIONS BE MIXED?

FEDERAL LAW PROHIBITS IT.

A CHEMICAL REACTION MAY OCCUR CAUSING CORNEAL PROBLEMS.

MANUFACTURES WILL NOT ALLOW IT.

LENSES MAY TEAR OR DETERIORATE FASTER

A CHEMICAL REACTION MAY OCCUR CAUSING CORNEAL PROBLEMS.

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WHICH OF THE FOLLOWING IS MOST EFFECTIVE IN REMOVING PROTEIN BUILDUP ON SOFT CONTACT LENSES?

ENZYMATIC CLEANER

HYPERTONIC SALINE

SODIUM BICARBONATE

TAP WATER

ENZYMATIC CLEANER

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A BUFFERING AGENT IS ADDED TO A SOLUTION TO HELP CONTROL:

TONICITY

BACTERIA

Ph LEVEL

WETTABILITY

Ph LEVEL

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WHAT IS THE PRIMARY FUNCTION OF A SURFACTANT CLEANER?

REMOVE SURFACE SCRATCHES

REMOVE LOOSELY ADHERENT DEBRIS

FROM THE LENS SURFACE.

REMOVE PROTEIN DEPOSITS

KILL MICROORGANISMS

REMOVE LOOSELY ADHERENT DEBRIS

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WHEN LENSES ARE DELIVERED TO THE PATIENT, THE WEARING SCHEDULE SHOULD BE:

DETERMINED BY THE PATIENT’S LEVEL
OF COMFORT

DETERMINED BY THE REFRACTION

VERBAL AND WRITTEN

UNSPECIFIED

VERBAL AND WRITTEN

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THE AVERAGE ph VALUE OF HUMAN TEARS IS:

7.4

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WHICH OF THE FOLLOWING PRESERVATIVES IS A MERCURY BASED COMPOUND?

DYMED

THIMEROSAL

POLYQUAD

SORBIC ACID

THIMEROSAL

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ALL OF THE FOLLOWING ARE FUNCTIONS OF A WETTING SOLUTION EXCEPT: IT CLEANS THE LENS AFTER REMOVAL IT PROVIDES A VISCOUS PROTECTIVE COATING OVER THE LENS SURFACE SO THE FINGER DOES NOT COME IN DIRECT CONTACT WITH THE FINGER DURING INSERTION. IT PROVIDES LUBRICATION BETWEEN THE LID AND LENS SURFACE. IT CONVERTS THE HYDROPHOBIC LENS SURFACE TO A HYDROPHILLIC ONE.

IT CLEANS THE LENS AFTER REMOVAL

A PATIENT COMPLAINS THAT THE CONTACT LENS IN HIS RIGHT EYE IS IRRITATING. UPON SLIT LAMP EXAMINATION YOU DISCOVER AN EMBEDDED FOREIGN BODY. YOU SHOULD: RECOMMEND LUBRICATION DROPS SEND THE PATIENT TO A DOCTOR USE TWEZZERS TO REMOVE THE FOREIGN BODY ADVISE THE PATIENT TO LEAVE THE LENS OUT A FEW DAYS AND RETURN FOR A CHECK UP.

SEND THE PATIENT TO A DOCTOR

IF FOGGING OCCURES IMMEDIATELY UPON INSERTION OF A CONTACT LENS: THE LENSES WERE NOT CLEANED PROPERLY THE OPTICAL ZONE IS TOO SMALL THE BASE CURVE IS TOO STEEP THE BASE CURVE IS TOO FLAT

THE LENSES WERE NOT CLEANED PROPERLY

LID EVERSION IS NECESSARY TO OBSERVE WHICH OF THE FOLLOWING CONDITIONS? KERATITIS SICCA BLEPHARITIS BULLOUS KERATOPATHY GIANT PAPILLARY CONJUNTIVITIS

GIANT PAPILLARY CONJUNTIVITIS

FOLLOW UP KERATOMETER READINGS ON AN ADAPTED RIGID LENS WEARER SHOULD BE WITHIN ______ FROM THE ORIGINAL READINGS. .30mm 1. 00D 1. 50D .50D

.50D

THE SUBJECTIVE SYMPTOM OF EDGE FLARE OR REFLECTION WITH A CONTACT LENS IS AGGRAVATED BY : TEARING DRY EYES A LARGE P.O.Z. A CLEAR LENS

TEARING

EPITHELIAL EDEMA WHICH MANIFESTS ITSELF CLINICALLY AS A GREY CORNEAL HAZE, IS VERIFIED BY THE SLIT LAMP USING SCLEROTIC SCATTER ILLUMINATION. WHAT SPECIFIC TECHNIQUE DOES THE EXAMINER USE TO SEE THIS CONDITION? HIGH MAGNIFICATION AND AN ANGLE BETWEEN THE BEAM AND SCOPE OF 180 DEGREES. THE GREEN FILTER OF THE SLIT LAMP WITH HIGH MAGNIFICATION. THE BLUE COBALT FILTER OF THE SLIT LAMP AND AN ANGLE OF ABOUT 45 DEGREES. THE NAKED EYE AND AN ANGLE BETWEEN THE SLIT LAMP BEAM AND THE EYE OF 45 to 90 DEGREES

THE NAKED EYE AND AN ANGLE BETWEEN THE SLIT LAMP BEAM AND THE EYE OF 45 to 90 DEGREES

WHICH OF THE FOLLOWING INSTRUMENTS IS BEST USED TO CHECK FOR LENS WARPAGE? MEASURING MAGNIFIER RADIUSCOPE PROJECTION MAGNIFIER PROFILE ANALYZER

RADIUSCOPE

POOR VISION AFTER CONTACT LENSES HAVE BEEN REMOVED AND REPLACED WITH SPECTACLES IS CALLED: BLURRING FOGGING CONTACT LENS BLUR SPECTACLE BLUR

SPECTACLE BLUR

WHICH OF THE FOLLOWING NEED NOT BE RECORDED ON EACH FOLLOW UP VISIT ? SUBJECTIVE AND OBJECTIVE FINDINGS ORIGINAL Rx AND LENS SPECIFICATIONS LENS CHANGES AND MODIFICATIONS KERATOMETRY

ORIGINAL Rx AND LENS SPECIFICATIONS

A STINGING AND BURNING SENSATION WHICH OCCURES EACH DAY AFTER SEVERAL HOURS OF WEAR MAY BE CAUSED BY A CONTACT LENS WHICH HAS: STAGNATION OF TEAR FLUID BEHIND THE LENS A FLAT BASE CURVE BEEN IMPROPERLY CLEANED NONE OF THE ABOVE

STAGNATION OF TEAR FLUID BEHIND THE LENS

ABRASIONS OVER THE APEX OF THE CORNEA CAN BE CAUSED BY: LENS CONSTANTLY RUBBING THE APEX LENS FITTING FLATTER THAN K CORNEAL EDEMA ALL OF THE ABOVE

ALL OF THE ABOVE

BUBBLES TRAPPED UNDER A RIGID LENS MAY RESULT IN __________. 3:00 - 9:00 STAINING STIPPLING STAINS DIMPLE VEILING PUNCTATE STAINS

DIMPLE VEILING

PERIPHERAL LIMBAL STAINING AT 3:00 AND 9:00 IS A RESULT OF : VIRAL INFECTION MECHANICAL EROSION BY THE LENS EXPOSURE CAUSING LIMBAL DRYNESS INCORRECT INSERTION

EXPOSURE CAUSING LIMBAL DRYNESS

WHICH OF THE FOLLOWING SHOULD A FITTER DO WHEN A SIGNIFICANT FOREIGN BODY STAIN ON THE CORNEA IS OBSERVED DURING A RIGID CONTACT LENS FOLLOW UP VISIT ? REFIT WITH A SOFT LENS REFIT WITH A THERAPEUTIC LENS REFIT WITH A FLATTER RIGID LENS CONSULT THE PRESCRIBER

CONSULT THE PRESCRIBER

A CONTACT LENS WEARER MAY EXPERIENCE EDEMA OF THE CORNEA BECAUSE OF : POOR OPTICS IN THE LENS OVER CORRECTION OF THE LENS ABSORPTION OF TEARS INTO THE CORNEA. UNDER CORRECTION OF THE LENS

ABSORPTION OF TEARS INTO THE CORNEA.

______________ is a multi-zone concentric soft bifocal contact lens. Acuvue Bifocal Unilens B&L Occasions Tangent Streak

Acuvue Bifocal

During the diagnostic evaluation of the following patient, the lens rotates 10 degrees to the left. Which of the following lens parameters would you order for the patient? Patient's Refraction: -2.50 -1.00 x 170 Diagnostic Lens: 8.7 -2.50 -1.00 x 170 ----------------------------------------------------------- 8.7 -2.50 -1.00 x 160 8. 7 -2.50 -1.00 x 170 8. 7 -2.50 -1.00 x 180 8. 7 -2.50 -1.00 x 10

8.7 -2.50 -1.00 x 180

Which of the following is a translating bifocal lens design? Segmented Concentric Aspheric Diffractive

Segmented

Prism ballast, double slab-off and peri-ballast are all used for what type of lens design? Therapeutic RGP Bitoric Soft toric Spherical

Soft toric

Which of the following lens designs would not provide a good visual result for this patient? K's 44.00 @180 / 42.50 @90 Rx -3.50 -1.50 x 90 -------------------------------------------------------- Soft toric lens Aspheric rigid gas permeable lens Soft spherical lens Spherical rigid gas permeable lens

Soft spherical lens

A bifocal lens in which the power gradually changes from the central area of the lens to the periphery is known as: A bitoric lens A monocentric lens An aspheric lens A crescent lens

An aspheric lens

GIVEN THE FOLLOWING Rx: O.D. -2.00 -2.00 x 110 IF THE DIAGNOSTIC TORIC SOFT LENS ROTATES 15 DEGREES CLOCKWISE, WHAT LENS AXIS SHOULD BE ORDERED? 95 125 140 110

125

A prism ballast RGP lens requires how much prism for proper orientation? 2. 00 to 4.00 D 1. 50 to 3.00 D 0. 25 to 0.50 D 0. 75 to 1.50 D

0.75 to 1.50 D

WHAT PRESBYOPIC LENS DESIGN WOULD YOU RECOMMEND FOR A PATIENT WITH THEN FOLLOWING PRESCRIPTION AND "K" READINGS ? O.D. -1.00 -1.50 X 180 O.D. 42.50 / 44.00@90 O.S. -0.50 -1.00 X 10 O.S. 41.75 / 42.75@100 ADD: +2.50 O.U. SOFT CONCENTRIC SPHERICAL SOFT MONOVISION RGP ASPHERIC RGP TRANSLATING

RGP TRANSLATING

WHEN FITTING A RIGID BACK SURFACE TORIC, APPROXIMATELY __________% OF THE CORNEAL TORICITY MAY BE PLACED ON THE POSTERIOR LENS SURFACE. 25 33 66 50

Keratoconus and penetrating keratoplasty fittings are best accomplished by which of the following? K's and Rx Nomogram Molded impression Diagnostic fitting

Diagnostic fitting

A lens fitted for keratoconus should: Align with the apex Ride high Flatten the apex Vault the apex

Align with the apex

On a compromised cornea, such as a that has undergone a corneal graft, what lens characteristic would be most beneficial? High tensile strength High wetting angle High DK/L High flexibility

High DK/L

Among the following choices, which is the latest lens design for keratoconus? Rose K Soper design Aspheric McGuire design

Rose K

A patient has a possible acuity of 20/25 but has anaridia and photophobia. What type of lens would you fit? Translucent lens without optics Opaque cosmetic lens with optics Opaque cosmetic lens with a black pupil Translucent lens with optics

Opaque cosmetic lens with optics

One might utilize which of the following lens designs given the following information: Ks: 46.00@ 100 / 49.00 @ 20 +2 distortion Rx: -7.00 -3.50 x 100 ------------------------------------------------------------ Menicon Plateau Ortho K Rose K Front surface toric RGP

Rose K

Which of the following conditions may benefit from an X-Chrom or Ruby Red lens? Colobomas Color deficiency Anaridia Corneal scars

Color deficiency

An aphakic patient with K reading of 40.50 @180 / 41.25 @ 90, large palpebral fissures and flaccid lower lids is a good candidate for a__________ lens. Myoflange lenticular RGP Single cut RGP Collegen Sheild Bitoric RGP

Myoflange lenticular RGP

Which of the following conditions may benefit from an iris lens with a black pupil? Anaridia Corneal scars Color deficiency Colobomas

Corneal scars

RGP lenses with a secondary curve steeper than the C.P.C. may be used for all of the following conditions except__________. Post RK Orthokeratology Aphakia Post LASIK

Aphakia

Which of the following is important to consider when asking questions of a patient? Allow the patient time to answer Ask only one question at a time Use words the patient can understand All of the above are important

All of the above are important

When comparing the cost of adding new patients to your practice versus keeping your current patients it is: 5 to 10 times more expensive to keep current patients 5 to 10 times more expensive to add new patients 5 to 10 times less expensive to add new patients None of the above

5 to 10 times more expensive to add new patients

If a patient must wait longer than expected before being seen: They should be told a shorter time than expected so they aren't discouraged They should expect to wait, it's a professional office They should be told a longer time than expected so they are pleasantly surprised when it's shorter They should be told honestly at the time of check-in

They should be told honestly at the time of check-in

When greeting a patient in the reception area: Smile when you greet them Say their name clearly Walk toward them All of the above

All of the above

When placing a caller on hold, you should always ask permission and then: Wait for their response Leave them on hold for 3 minutes only efficiently place them on hold Thank them

Wait for their response

Tidying the reception area should be done: When it gets messy At the end of each day At the beginning of each day Throughout the day

Throughout the day

How should you refer to the patient by name? First names only "Hon" or "Dearie" Title (eg. Mr., Mrs, Ms. And last name) Last names only

Title (eg. Mr., Mrs, Ms. And last name)

A ringing telephone should be answered by the:

3RD RING

ANSI- GP Lenses: CPC Tolerance

+/- 0.25mm or 0.12D

ANSI- GP Lenses: CPC Verification

Radiuscope | Keratometer

ANSI- GP Lenses: POWER Tolerance

+/- 10.00 Diopters = +/- 0.12D | > 10.00 Diopters = +/- 0.12D

ANSI- GP Lenses: POWER Verification

Lensmeter | Projection Lensmeter

ANSI- GP Lenses: Total Diameter Tolerance

+/- 0.05mm

ANSI- GP Lenses: Total Diameter Verification

V-Channel, Slip or Slot Gauge Measuring Magnifier Projection Magnifier

ANSI- GP Lenses: Center Thickness Tolerance

+/- 0.02mm

ANSI- GP Lenses: Center Thickness Verification

Thickness Gauge

S.O.A.P.

S.ubjective O.bjective A.ction P.atient Instructions

``` 4 6 8 10 RULE from Spectacle to Contacts ```

``` 4= .25 or 1/4 6= .50 or 1/2 8= .75 or 3/4 10= 1.00 Diopter ```

Glasses vs Contacts: | More _____ power and less ____ power in contacts than glasses.

plus/minus

R.S.V.P.

R.edness S.ecretion V.ision loss P.ain

Designing GP Lenses Ks O.D. 41.00 / 42.50 @ 100 O.S. 40.25 / 41.50 @ 80 Rx O.D. -8.25 +1.50 x 100 O.S. -9.00 +1.25 x 80 H.V.I.D.: 11.5mm V.D: 12mm

CPC POWER DIAMETER O.D. _41.00_______-6.25________9.6_____ O.D. _40.75_______-6.00________9.6_____ O.D. _ 40.50______ -5.75________9.6_____ O.S. _ 40.25______-7.12__________9.6____ O.S. _ 40.00______-6.87_________9.6____ O.S. _ 39.75 ______-6.62_________9.6____

Designing Soft Contact Lenses Ks O.D. 43.75 / 43.25 @ 110 O.S. 44.25 / 43.50 @ 120 Rx O.D. +5.50 -0.50 x 110 O.S. +7.00 -1.00 x 120 H.V.I.D.: 11.5mm V.D.: 12mm

BASE CURVE POWER DIAMETER O.D. ___8.6________+5.50 or +5.75 __14.0____ O.S. ___8.6_________+7.00_________14.0____

Soft Lens Correction: Spherical

Rx Astigmatism < 1.00 D | Rx SPHERE to CYL Ratio > 3 to 1

Soft Lens Correction: Toric Designs

Front Surface Back Surface Stock Custom

Rigid Lens Correction: Spherical

Residual Astigmatism <1.00 D | Corneal Astigmatism <3.00 D

Rigid Lens Correction: Toric Designs

Front Surface Back Surface Bitoric

_______illumination, the light is thrown out of focus so it spreads over a large portion of the eye. A filter may be needed to dim the light to a comfortable level for the patient. Magnification is kept low to maintain a large field of view. This is a good illumination to use for a general survey of the cornea, sclera and lids.

Diffuse

_______illumination, the light is focused into a sharp slit of 2mm or less. The viewer looks into this slit. A 1-2mm slit gives a _________ section that separates the anterior and posterior cornea.

Direct / Parellelpiped

lens position and movement surface wettability of the cornea or contact lens tear break-up time gross corneal staining blink reflex

DIFFUSE

determine which layer of the cornea is involved detect irregular topography view the lens/cornea relationship

OPTICAL SECTION

hazy lenses fine epithelial edema endothelial cells surfaces of the crystalline lens

Specular Reflection

____________________ is when the lamp and microscope are at equal angles to the midline, a perfectly smooth transparent surface will reflect a mirror image of the lamp bulb. If the surface is not perfectly smooth, the viewer sees the texture of the surface rather than the mirror image.

Specular Reflection

_______ is a narrower slit, which allows the observer to see individual layers of a transparent structure.

Optical Section

_______is set up much like a parallelpiped section, but the viewer looks to the side of the slit instead of directly into it. Very effective for inspecting opaque structures, such as: lids and lashes sclera and conjunctiva

Indirect

corneal vascularization and scarring edema, microcysts deposits on the contact lens or cornea

Retro-illumination

A halo effect is produced when a bright beam is directed toward the limbus at a wide angle. The halo is caused by light being reflected internally between the corneal epithelium and endothelium. Anything in the substance of the cornea that is non-transparent is visible in this reflected light, but the classic use for this illumination is the detection of: Opacities Central Corneal Clouding or patch edema

Sclerotic Scatter

_________ uses reflected light from the iris or retina to backlight something opaque or translucent in the cornea. The examiner sees the shadowed side of the object against the bright background.

Retro-illumination

2501 Flashcards

FINAL EXAM PREP