CO Optical Instruments & Diagnostic Equipment Flashcards
6 cards from real CO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CO Optical Instruments & Diagnostic Equipment flashcards as text
The Bagolini striated lens test is used to evaluate which aspect of binocular vision?
Answer: Retinal correspondence and suppression
Bagolini striated lenses test retinal correspondence and suppression under near-natural viewing conditions by creating streak images from a point source.
A keratometer (ophthalmometer) is used to measure which ocular parameter?
Answer: Corneal curvature/power
A keratometer measures the curvature of the anterior corneal surface, which is essential for contact lens fitting and detecting astigmatism.
When performing retinoscopy, a 'with' motion of the reflex indicates which refractive state?
Answer: Hyperopia or myopia less than working distance
A 'with' motion in retinoscopy occurs when the patient's far point is beyond the examiner, indicating hyperopia or myopia less than the working distance correction.
The Hess screen test and the Lee screen test both map the positions of gaze to identify which condition?
Answer: Extraocular muscle paresis or restriction
Hess and Lee screen tests plot ocular motility in all nine diagnostic positions of gaze to identify and localize paretic or restricted extraocular muscles.
When calibrating a prism cover test measurement, what does the endpoint (neutralization point) indicate?
Answer: No refixation movement when cover is moved
Neutralization is reached when no refixation movement is observed as the cover is alternated, meaning the prism has fully corrected the measured deviation.
The 4-prism diopter base-out test is used to detect which condition?
Answer: Central suppression scotoma in the fovea
The 4Δ base-out test detects a small central suppression scotoma: a normal response shows both eyes moving, while suppression causes only the fellow eye to move.