COT Patient History and Ophthalmic Examination Techniques 2

Question 1

Which method is used to test color vision and is most sensitive for detecting red-green deficiencies?

Accepted Answer

Ishihara pseudoisochromatic plates

Answer

Ishihara pseudoisochromatic plates are the standard screening tool for red-green color vision deficiencies and are highly sensitive for these common defects.

Question 2

When recording extraocular muscle (EOM) function, 'full' motility means the eye moves:

Accepted Answer

In all nine cardinal positions of gaze without limitation

Answer

Full extraocular muscle motility means the eye moves completely and without restriction or pain through all nine cardinal positions of gaze.

Question 3

Corneal light reflex testing using the Hirschberg method estimates how many prism diopters of deviation for each millimeter of decentration?

Accepted Answer

7 prism diopters

Answer

The Hirschberg test estimates approximately 7 prism diopters of deviation for each 1 mm the corneal light reflex is decentered from the pupil center.

Question 4

Which notation system is used to document the status of the lens during slit-lamp examination?

Accepted Answer

LOCS (Lens Opacities Classification System)

Answer

The Lens Opacities Classification System (LOCS) provides a standardized grading scale for nuclear, cortical, and posterior subcapsular cataracts.

Question 5

When obtaining a patient's ocular history, asking about prior LASIK or refractive surgery is important primarily because it affects:

Accepted Answer

IOP measurements and IOL power calculations

Answer

Prior corneal refractive surgery alters corneal curvature and thickness, making standard IOP measurements and IOL power calculations inaccurate without correction factors.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Patient History and Ophthalmic Examination Techniques 2