VF: Sem2 Feeback Questions (relevant useful ones) Flashcards
What has the higher density of photopigment, cones or rods?
Rods
In comparison with the scotopic rod system, the photopic cone system is characterised by:
a. high sensitivity
b. good temporal resolution
c. low acuity
d. absence from the fovea
good temporal resolution
Relative to a single flash of illuminance 170 lux presented for one second, a single flash with the same illuminance presented for 50 milliseconds would appear:
a. one twentieth as bright.
b. half as bright.
c. the same brightness.
d. brighter.
Brighter
Which of the following about adaptive methods used in perimetry is CORRECT?
a. ZEST calculates a new probability density function after subject response
b. SITA has a longer test time than Full Threshold perimetry
c. ZEST is the only method that uses the maximum-likelihood procedure
d. SITA terminates when a fixed number of trials has occurred
a. ZEST calculates a new probability density function after subject response
Which of the following regarding pathological haloes is correct?
a. Other pathologies that can cause a corneal halo include contact lens overwear and corneal stromal dysfunction
b. In the Emsley-Fincham test, glaucomatous halos will rotate, resembling the arms of a windmill and appear dim
c. In the Emsley-Fincham test, physiological halos will not rotate and remain intact
d. Closed angle glaucoma causes interfibrillar separation of collagen fibres, leading to an overlap in diffraction patterns and increasing light scatter
d. Closed angle glaucoma causes interfibrillar separation of collagen fibres, leading to an overlap in diffraction patterns and increasing light scatter
An independent blind comparison was made with a gold standard for diagnosis of glaucoma among 100 patients at UM eye care. Among 25 patients found to have glaucoma according to the gold standard, 18 patients were positive for the test. Among 75 patients found not to have glaucoma according to the gold standard, 15 patients were found to be positive for the test. Which of the following answer is CORRECT?
b. The specificity was 80%
Some studies have found that left-handed people are more likely to be left-eye dominant. Which one of these statements is MOST CORRECT regarding this correlation?
A) The dorsal visual pathway, like handedness, is asymmetric.
B) Better VA in a visual hemifield leads to dominance in the corresponding hand.
C) Handedness and ocular dominance are controlled by independant genes, but that these genes are in linkage disequilibrium.
D) Handedness is established in the same 6 month postnatal critical period in which ocular dominance is established, and the two traits interact closely.
C) Handedness and ocular dominance are controlled by independant genes, but that these genes are in linkage disequilibrium.
Which of the following statements about anomalous retinal correspondence is INCORRECT?
A) A patient with harmonious ARC possesses single binocular vision despite a tropia.
B) ARC can occur when corresponding retinal points are not directed towards identical objects.
C) Patients with ARC do not require suppression for single vision.
D) In most cases ARC does not require treatment.
C) Patients with ARC do not require suppression for single vision.
Which of these is not a test for anomalous retinal correspondence (ARC)? A) Stereopsis B) Bagolini's striated glasses test C) Worth 4 dot test D) Red filter test
Stereopsis
Which of the following statements regarding the classification of ARC is INCORRECT?
A) The subjective angle of ARC determines when the patient subjectively merges the two images.
B) In Harmonious ARC there is a pseudo-fovea that partially compensates for the angle of deviation and there is still single binocular vision despite a tropia.
C) Unharmonious ARC results in double vision or confusion where the pseudo-fovea does not match the angle of strabismus.
D) Paradoxical diplopia, the image is displaced off the pseodo-fovea and despite the image falling on the anatomic fovea after surgery, the patients will still see double.
B) In Harmonious ARC there is a pseudo-fovea that partially compensates for the angle of deviation and there is still single binocular vision despite a tropia.
Which of the following clinical situations is ocular dominance least relevant? A) Monovision contact lenses B) Development of amblyopia C) Stereopsis D) Refractive error
D) Refractive error
Which of the following clinical tests is least relevant for ocular dominance? A) Distant stereopsis B) Plus 1D test C) Near point of accommodation D) Worth 4 dot test
C) Near point of accommodation
