Quiz 3 Flashcards
What are the things to be looking for when examining the macula?
- foveal light reflex
- elevation
- hemorrhages
- exudates
What are the associated conversion factors for each of the three lenses used in fundoscopy: 60D, 78D, 90D?
- 60D = ONH size * 0.88
- 78D = ONH size * 1.1
- 90D = ONH size * 1.3
What is the magnification of a 20D lens while performing BIO?
3x
What bears most of the weight of the BIO?
crown headband
How do you fix vertical diplopia for the doctor when performing BIO?
grossly tilting headset
How do you fix horizontal diplopia for the doctor when performing BIO?
realign PD, increase working distance
What are vortex ampullae the site of?
choroidal circulation drainage
Where are long posterior ciliary arteries and nerves typically located in the eye?
temporal and nasal
Where are short posterior ciliary arteries and nerves typically located in the eye?
superior and inferior
What is the optical system that is used in direct ophthalmoscopy? 1. What are the components of it? 2
- coaxial optical system
2. concave mirror, light source, lenses
What is the fixation aperture for direct used for?
eccentric fixation
What is the slit aperture for direct used for?
depth for assessment of tumors, lesions and the cup
What is the red free light for direct used for?
better view of retinal vasculature, RNFL, and choroidal vs retinal lesions
What amount should the ophthalmoscope be off the vertical when performing direct? 1. Where should it be located horizontally? 2
- 10-20deg off vertical
2. 15deg temporal
When performing direct, what is the movement the an opacity will make if it is on the cornea? 1. On the lens? 2
- against motion
2. with motion
What are the ways to fix the problem of reflections while doing direct?
- move off center slightly
- use smaller aperture
- decrease light intensity
Where will sloping of the cup always be located?
temporal
What should be used to clean after dealing with a patient with “red eye”?
disinfecting spray (Envirocide or opticide)
What is the physical removal of organic material or soil from objects called?
cleaning
What is the intermediate measures between physical cleaning and sterilization called? 1. What are examples? 2
- disinfection
2. pasteurization and chemical germicides
What is the destruction of all forms of microbial life called? 1. What are examples? 2
- sterilization
2. steam under pressure, dry heat, chemical vapor, and ethylene gas
Where are instruments taken to be autoclaved?
Advanced Ocular Care Services
What are the two methods for cleaning the tonometry probe?
- 70% isopropyl alcohol swab
2. soak in bleach or hydrogen peroxide solution
How long are double cloth and paper wrapped instruments sterile for?
up to one month
