COA Study Cards 151-204

What is a contraindication to contact lens wear?

• Seizure disorders

• Strabismus as a child

• High blood pressure

• Cataracts

How are the ultrasound biometric measurements obtained?

• The anterior lens spike should be lower than posterior lens spike.

• The patient must have good vision.

• The probe should be aligned along the visual axis of the eye.

• The biometrist must press firmly on the globe.

Which of the following statements BEST describes the process used to check the accuracy of the Goldmann applanation tonometer?

• It should be calibrated daily for reliable results.

• It can be performed in the office with a calibrating rod.

• It can only be handled at the factory or instrument repair shop.

• It is accomplished with a test sphere with a standard tension of 20 mm Hg.

What is the MOST commonly used technique to perform a B-scan?

• Slit lamp

• Handheld probe

• Computed topography (CT)

• Magnetic Resonance Imaging (MRI)

In A-scan biometry, which ocular measurement provides the axial length of the globe?

• Anterior corneal surface to anterior vitreous face

• The distance between corneal surface and the retinal surface

• Pre-corneal tear film to the posterior pole

• Pre-corneal tear film to the posterior face

Axial length is provided by which measurement?

• Precorneal tear film to the posterior vitreous face

• Anterior corneal surface to the macula

• Anterior corneal surface to the optic disc

• Anterior pole to the posterior pole

What A-scan measurement is MOST important in determining intraocular lens (IOL) power?

• Corneal curvature

• Anterior chamber depth

• Lens thickness

• Axial length

Which ocular tissue produces A-scan spikes?

• Lens

• Choroid

• Optic disc

• Vitreous

Which ocular tissue produces A-scan spikes?

• Lens

• Choroid

• Optic disc

A statement that describes the BEST use of A-scan ultrasonography would be to

• Detect a choroidal detachment

• Detect a retinal detachment

• Define the size and location of intraocular masses

• Depict a two-dimensional image of the orbit and globe