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What is another name for a keratometer?
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What is the keratometer mainly used for?
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Contact Lab Exam
| Question | Answer |
|---|---|
| What is another name for a keratometer? | ophthalmometer |
| What is the keratometer mainly used for? | measure the radius of curvature of the cornea |
| What are some other uses for the keratometer? | follow up K's; check the fit of a soft C/L; check flexing of GP lens; with Con-Ta-Check attachment we can check the base curve of a GP lens |
| What is the index of refraction used to calibrate the keratomenter? | N of tears 1.3375 |
| What are the keratometer power drums calibrated in? | Diopters |
| What is an attachment to the keratometer used to measure the corneal curvature values across multiple points on the cornea? | Topogometer |
| What is the normal keratometer diopter range? | 36.00 to 52.00 |
| What is the extended keratometer diopter range? | 30.00 to 61.00 |
| Which lens is used to extend the keratometer range for a patient having a cornea flatter than normal range? | -1.00 |
| Which lens is used to extend the keratometer range for a patient having a cornea steeper than normal? | +1.25 |
| What is transient mire distortion caused by? | Dry eyes, but blinking should clear the mires |
| What are irregular mire distortions that don't clear up after blinking caused by? | Keratoconus; corneal warpage; injury; surgery; overwear of contact lenses |
| What is with the rule astigmatism? | Cornea has the flattest meridian horizontally; 0-30 degrees and 150-180 degrees |
| What is against the rule astigmatism? | Cornea has the flattest meridian vertically; 60-120 degrees |
| What is oblique astigmatism? | When the principle meridians are located diagonally from one another; 31 to 59 degrees and 121-149 degrees |
| What is irregular astigmatism? | The two principle meridians are not 90 degrees from one another. |
| What is the average blink rate? | every 3-6 seconds; 10-17 times per minute |
| What is the average BUT? | 10-12 seconds |
| What is the average palpebral fissure? | 10-10.5 mm |
| What is the average HVID (horizontal vertical iris distance)? | 11.5 mm |
| What is the average pupil diameter? | 4.5 -5 mm |
| What are some respiratory disorders that could effect contact wear? | Rhinitis; sinusitis; hay fever; asthma; allergies |
| What problems do respiratory disorders cause that effect contact wear? | enlarged blood vessels; photophobia; itching; lacrimation; burning; ocular sensitivity; debris in the tears |
| Patients with respiratory disorders would be best fit with _________? | single use |
| What problems will patients with diabetes have with contact wear? | have a higher risk of infection, due to decreased healing process; need more follow-ups; need to be warned about over-wearing, cleaning properly, throwing out when supposed to |
| Patients with diabetes are good candidates for single use depending on the ________? | prescription |
| What type of endocrine (hormonal) changes effect contact wear and why? | Pregnancy, menopause, and the use of birth control pills; causes dry eyes and deposits on lenses |
| How does thyroid disease effect contact wear? | protrusion and drying of the eyes can cause the lens to dislodge easier |
| What problems does rheumatoid arthritis cause for wearing contacts? | dry eyes and may have problem handling lenses |
| What type of skin diseases can effect contact wear if they are found around the eyes? | Seborrhea; psoriasis; neurodermatitis; blepharitis; rosacea; eczema |
| What type of medications effect contact wear? | Acutane; Dyazide and Lasix; Lanoxin; Donnatal; Valium; Antihistamines; Decongestants |
| What complications can medications cause that effect contact wear? | dry eyes; photophobia; fluctuation in vision; decreased corneal sensitivity; decreased blink rate; mydriases; also can effect lids and conjunctiva |
| What is another name for the slit lamp? | Biomicroscope |
| What magnification should we start with during a slit lamp exam? | 6X or 10X |
| What type of illumination should we start with during a slit lamp exam? | low illumination |
| How much of angle should be between the light and the microscope? | 45-50 degree |
| What should the height of the light be to begin with? | 12 mm |
| What should the width of the light beam be to begin with? | 2-3 mm |
| Where should the light beam be to begin with while you are making adjustments? | On the outer canthus |
| What does all the focusing on the slit lamp? | joystick |
| When using the slit lamp, where should your hands be positioned? | One on the slit width control knob and one on the joystick |
| *Look over all illuminations in notes* | Diffuse; Parallel Piped; Optic Section; Specular Reflection; Conical Beam; Retro; Sleratic Scatter; Tangential |
| *Look over the colors for slit lamp and what they are used for* | Blue, Green, and White |
| What soaps are best used for hand washing? | Ivory, Pure and Natural, Neutrogena; Optical Soap |
| What is the proper hand washing procedure? | Remove jewelry; Turn on faucet using paper towel; wet hands; apply soap; keep hands at a lower angle; rub hands together vigorously, wash both sides; rinse; dry start with finger tips to wrist; turn off using a clean paper towel |
| How are rigid lenses cleaned? | with 2-4 drops of Boston cleaner; using pinky rub from center to the outer edge (not in circles) flip over, clean the other side; hold lens and rinse with saline or water; pat dry |
| What is the proper procedure for eye wash station? | flush 3 minutes once per week |
| What is the emergency phone number? | 882-4500 |
| What is the topographer used for? | produces color-coded maps to the cornea to show where it is the flattest and weakest |
| What do the blue (cool) colors represent on a topography map? | Flat curves |
| What do the red (hot) colors represent on a topography map? | steep curves |
| What are other names for the topographer? | video keratoscope and photokeratoscope |
| What are other names for the measuring magnifier? | Loupe/Monocular Magnifier/Handheld Magnifier |
| What is the measuring magnifier used for? | 7x or 10x magnification; magnifies to inspect lens; can also measure diameter, PPC, and seg height; and optical zone |
| What is another name for the radiuscope? | radiusguage |
| What does the readiuscope measure? | Base curve |
| What are other names for base curve? | posterior peripheral curve; peripheral posterior curve |
| What is another name for the shadowgraph? | Projection magnifier |
| What is the shadowgraph used for? | projects and magnifies; used to inspect contacts and measure diameter, optical zone, and peripheral curves |
| What is the fluorescent tube light used for? | To evaluate the blends; look for J or ski-edge |
| What is the profile analyzer used for? | To inspect blends and junctures |
| What is the Con-ta-check also known as? | Lenscometer |
| What is con-ta-check? | attachment to keratometer used to measure base curve of a GP lens |
| What is another name for Burton Lamp? | Wood's Light; invented by Robert Wood |
| What is the burton lamp? | hand held instrument used to evaluate the cornea and contact in situ; can also be used to view staining and for BUT |
| What is the CT Gauge also known as? | Dial Gauge; Thickness Gauge |
| What is the thickness gauge used for? | to measure the center thickness of a GP lens |
| What is another name for diameter gauge? | Slot gauge, V-groove |
| What is diameter gauge used for? | Measure the diameter of a GP lens |
| What are the other names for the Lensometer? | Vertometer; Focimeter; Lensmeter |
| What is the lensometer used for? | measure the power of the GP lens |
Created by:
griffiskr
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