COT Optometry 4

Question 1

A patient's manifest refraction is +1.00 D but cycloplegic refraction shows +3.00 D. The hidden +2.00 D is called:

Accepted Answer

Latent hyperopia

Answer

Latent hyperopia is the portion of hyperopia that is masked by accommodative tone and only revealed under cycloplegia.

Question 2

The amplitude of accommodation formula using the push-up method calculates accommodation from the near point distance. If the near point is 10 cm, the amplitude is:

Accepted Answer

10 D

Answer

Amplitude of accommodation = 1/near point distance in meters = 1/0.10 m = 10 D.

Question 3

Which condition is characterized by an increase in the refractive index of the crystalline lens, typically seen in early nuclear cataracts?

Accepted Answer

Index myopia

Answer

Index myopia occurs when the refractive index of the lens nucleus increases (as in early nuclear sclerosis), increasing its converging power.

Question 4

What is the standard working distance used in retinoscopy, and what lens does the examiner add to neutralize this distance?

Accepted Answer

50 cm / +2.00 D

Answer

The standard retinoscopy working distance is 67 cm (adding +1.50 D) or 50 cm (adding +2.00 D); 67 cm/+1.50 D is most common in the US.

Question 5

Which term describes the difference in refractive error between the two eyes?

Accepted Answer

Anisometropia

Answer

Anisometropia is the condition in which the two eyes have significantly different refractive errors, which can cause amblyopia if present during visual development.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Optometry 4