COT - Certified Ophthalmic Technician Refraction and Retinoscopy Questions and Answers

Question 1

When performing retinoscopy with the sleeve down (Plano mirror effect), you observe "with" motion. What type of lens power should be added to the phoropter to neutralize this reflex?

Accepted Answer

Plus sphere

Answer

Minus sphere

Answer

Plus cylinder

Answer

Minus cylinder

Question 2

A patient is undergoing retinoscopy from a working distance of 67 cm. The gross retinoscopy finding in the phoropter is +3.50 D sphere. What is the patient's net (final) refractive error?

Accepted Answer

+2.00 D

Answer

+5.00 D

Answer

-1.50 D

Answer

+3.50 D

Question 3

During retinoscopy, you notice that the reflex in the 90-degree meridian is thin and moves quickly, while the reflex in the 180-degree meridian is wider and moves more slowly. Which of the following does this most likely indicate?

Accepted Answer

Astigmatism

Answer

Spherical refractive error

Answer

High myopia

Answer

Media opacity like a cataract

Question 4

A technician is performing retinoscopy on a new patient and finds the reflex to be very dim and slow-moving. Which of the following is the most likely cause for these findings?

Accepted Answer

A high refractive error

Answer

A small refractive error

Answer

The patient is accommodating

Answer

The retinoscope sleeve is in the wrong position

Question 5

Which of the following is the primary purpose of retinoscopy in a clinical setting?

Accepted Answer

To obtain an objective measurement of the patient's refractive error

Answer

To measure the intraocular pressure

Answer

To assess the health of the retina

Answer

To determine a subjective starting point for refraction

Question 6

A prescription written by an ophthalmologist is +1.00 +1.50 x 090. How would this prescription be written in minus cylinder form for the optical lab?

Accepted Answer

+2.50 -1.50 x 180

Answer

-0.50 -1.50 x 180

Answer

+1.00 -1.50 x 180

Answer

+1.50 +1.00 x 180

When performing retinoscopy with the sleeve down (Plano mirror effect), you observe "with" motion.What type of lens power should be added to the phoropter to neutralize this reflex?

When performing retinoscopy with the sleeve down (Plano mirror effect), you observe "with" motion.
What type of lens power should be added to the phoropter to neutralize this reflex?