11 Questions
Where is the apparent light source located when concave light rays are created using a retinoscope?
In front of the retinoscope
What type of light rays are created when the apparent light source is behind the retinoscope?
Parallel light rays
What provides the current source in a retinoscope?
Battery in the handle
At what angle should the doctor stand in relation to the patient's line of sight during retinoscopy?
15 degrees temporal
What does the reflex observed during retinoscopy describe?
The power of the eye in the meridian perpendicular to the light beam
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
Why is near infrared radiation (NIR) used in autorefractors?
Because it is invisible to the patient
How does an autorefractometer calculate the vision correction a patient needs?
By using sensors that detect reflections from a cone of infrared light
What does the autorefractor measure in at least three meridians of the eye?
Refraction of the eye
How does the autorefractor determine when a patient's eye properly focuses an image?
By changing magnification until the image is in focus
What is a main disadvantage of using near infrared radiation (NIR) in autorefractors?
It is more scattered from the fundus compared to other Radiation
Learn about the retinoscopy technique including the use of plane mirror and concave mirror effects. Understand how the apparent light source location affects the creation of parallel or concave light rays. Explore how to handle the retinoscope and its battery for optimal performance.
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