Part 1 Flashcards
(103 cards)
What is the central field of vision?
A 25-30 degree area of vision around the fixation point
To photograph the posterior pole, the center of focus is
between the macula & the optic disc
What is first seen (recorded) in fluorescein angiography?
Choroidal flush
Which of the following properly represents the steps used to convert a spherocylindrical lens into its spherical equivalent?
Divide the cylinder power in half then add the spherical power
What are the two types of bridges located on a spectacle frame?
Keyhole & saddle
Part of the rules for transposition is to change the axis of the cylinder by how many degrees?
90
What is a contraindication to contact lens wear?
seizure disorders
Spectacle blur is unclear vision associated with
changing from contacts to spectacles
changing the base curve of a contact lens changes the fitting characteristics of that lens due to a change in sagittal depth. increasing the base curve radius of a contact lens while maintaining the same diameter will cause the lens to fit
flatter & looser
Extended wear contact lenses are made of materials that allow greater permeability of
oxygen
daily wear contact lenses should be removed each night or patients are at greater risk of developing what condition
corneal edema
which ocular tissue produces A-scan spikes
lens
Advances in digital imaging technology facilitated the practical use of what type of dye
indocyanine green
what is the condition where parallel rays of light come to focus at a point just in front of the retina with respect to the unaccommodated eye?
myopia
what is the purpose of dilating the eye?
Allow a more complete posterior segment exam
which type of imaging provides a cross-sectional view of the retina that is useful in evaluating glaucoma?
Optical coherence tomography
what imaging technique does NOT provide a color-coded map?
indocyanine green chorioangiography (ICG)
Which of the following is the BEST method for kinetic testing of the central visual field?
Tangent screen
In what phase is the “choroidal flush” seen
Pre-arterial
A statement that describes the BEST use of A-scan ultrasonography would be to
define the size & location of intraocular masses
Which instrument is BEST suited to evaluate the refractive states of the eye?
Retinoscope
What does the abbreviation JCAHPO stand for?
Joint Commission on Allied Health Personnel in Ophthalmology.
What does an orthoptist do?
evaluation and treatment of eye movement problems and binocular vision. They are uniquely trained to treat disorders such as amblyopia, genetic disorders, and complex pediatric and adult strabismus.
Which eye care professional can fit a patient with a prosthetic eye?
ocularist