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Retinoscopy Technique and Mirror Effects

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Retinoscopy Technique and Mirror Effects

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Questions and Answers

Where is the apparent light source located when concave light rays are created using a retinoscope?

To the right of the retinoscope
Above the retinoscope
In front of the retinoscope (correct)
Behind the retinoscope

What type of light rays are created when the apparent light source is behind the retinoscope?

Collimated light rays
Divergent light rays
Concave light rays
Parallel light rays (correct)

What provides the current source in a retinoscope?

Battery in the handle (correct)
Eye wells
Sleeve
Mirror

At what angle should the doctor stand in relation to the patient's line of sight during retinoscopy?

15 degrees temporal (B) Signup and view all the answers

What does the reflex observed during retinoscopy describe?

The power of the eye in the meridian perpendicular to the light beam (C) Signup and view all the answers

What is the main purpose of an autorefractometer during an eye examination?

To measure a person's refractive error and provide a prescription for glasses or contact lenses (A) Signup and view all the answers

Why is near infrared radiation (NIR) used in autorefractors?

Because it is invisible to the patient (A) Signup and view all the answers

How does an autorefractometer calculate the vision correction a patient needs?

By using sensors that detect reflections from a cone of infrared light (D) Signup and view all the answers

What does the autorefractor measure in at least three meridians of the eye?

Refraction of the eye (C) Signup and view all the answers

How does the autorefractor determine when a patient's eye properly focuses an image?

By changing magnification until the image is in focus (D) Signup and view all the answers

What is a main disadvantage of using near infrared radiation (NIR) in autorefractors?

It is more scattered from the fundus compared to other Radiation (B) Signup and view all the answers