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
What instrument is used to measure the curvature of the anterior corneal surface?
Answer: Keratometer
A keratometer measures the curvature of the anterior corneal surface in two principal meridians.
The slit lamp biomicroscope is primarily used to examine which ocular structures?
Answer: Anterior and posterior segments of the eye
The slit lamp provides magnified illuminated examination of both anterior and posterior eye segments.
What is the primary purpose of performing retinoscopy?
Answer: Determine refractive error objectively
Retinoscopy is an objective technique to determine a patient's refractive error by observing the light reflex.
Which instrument provides a wide-field inverted view of the fundus?
Answer: Binocular indirect ophthalmoscope
The binocular indirect ophthalmoscope provides a wide-field stereoscopic view of the fundus using a condensing lens.
A lensometer (lensmeter) is used to measure which of the following?
Answer: Prescription power of spectacle lenses
A lensometer measures the sphere, cylinder, axis, and prism of an existing spectacle lens.
A-scan ultrasound biometry is primarily performed to measure:
Answer: Axial length of the eye
A-scan ultrasound measures the axial length of the eye, which is essential for intraocular lens power calculation.