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Optometric Principle and Best Focus Principle Quiz

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Optometric Principle and Best Focus Principle Quiz

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Questions and Answers

What is the focus of the Best Focus Principle in optometry?

Measuring the intensity of light entering the eye

Analyzing the shape of the Fundus Reflex

Examining the color spectrum reflected by the Retina

Achieving highest contrast during target focus on the Retina (correct)

What characteristics of the Fundus Reflex are being observed during the optometric principle?

Frequency and wavelength compared to the Incident beam

Intensity and color compared to the Incident beam

Shape and size compared to the Incident beam

Direction of motion and speed of motion compared to the Incident beam (correct)

How does mild defocusing on the Retina affect image contrast?

Diminishes contrast level (correct)

Creates a blur effect on the image

Increases contrast level

Has no impact on contrast level

In cases of Emmetropia, what happens to the images of a target?

They are focused properly on the Retina and achieve highest contrast Signup and view all the answers

What does auto-reflection in optometry involve?

Measuring fundus image size at different meridians for refractive error calculation Signup and view all the answers

How is refractive error calculated using auto-reflection in optometry?

Based on ocular magnification and minification compared to Emmetropia Signup and view all the answers

What is the first step in the autorefractor testing procedure?

Positioning the patient's head on the chin rest and forehead rest Signup and view all the answers

What needs to be done once the image of the patient's eye is focused on the monitor?

Position the square at the pupil reflex Signup and view all the answers

How is the final reading for refractive error determined?

By averaging three different readings Signup and view all the answers

What happens when the capture button is pressed during autorefractor testing?

Infra-red rays are bounced off from the retina to determine refractive power Signup and view all the answers

What is the purpose of moving the joystick during autorefractor testing?

To adjust the view of the patient's eye on the monitor Signup and view all the answers

Which area of the eye should the square be positioned at once the image is focused on the monitor?

Pupil reflex Signup and view all the answers