Ophthalmic Instruments and Procedures Flashcards
6 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Ophthalmic Instruments and Procedures flashcards as text
When performing keratometry, what information is obtained?
Answer: Anterior corneal curvature in the principal meridians
Keratometry measures the radius of curvature of the anterior cornea in the flattest and steepest meridians.
The Amsler grid is specifically used to detect abnormalities in:
Answer: Central macular function
The Amsler grid detects metamorphopsia and central scotomas within the central 20 degrees of the visual field.
What is the primary diagnostic purpose of fluorescein angiography?
Answer: Evaluate retinal and choroidal circulation
Fluorescein angiography documents retinal and choroidal blood flow by imaging intravenous fluorescent dye.
Which device is used to calculate intraocular lens power before cataract surgery?
Answer: Optical biometry device (e.g., IOL Master)
Optical biometry devices measure axial length and corneal curvature to calculate the appropriate IOL power.
Compared to indirect ophthalmoscopy, the direct ophthalmoscope provides:
Answer: Higher magnification of a small fundus area
The direct ophthalmoscope provides approximately 15× magnification but only a small field of the fundus.
Corneal topography is most useful for detecting:
Answer: Irregular corneal surface changes such as keratoconus
Corneal topography maps the entire corneal surface curvature, revealing irregularities like keratoconus or post-surgical changes.