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?

<p>They are focused properly on the Retina and achieve highest contrast (B)</p> Signup and view all the answers

What does auto-reflection in optometry involve?

<p>Measuring fundus image size at different meridians for refractive error calculation (D)</p> Signup and view all the answers

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

<p>Based on ocular magnification and minification compared to Emmetropia (B)</p> Signup and view all the answers

What is the first step in the autorefractor testing procedure?

<p>Positioning the patient's head on the chin rest and forehead rest (C)</p> Signup and view all the answers

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

<p>Position the square at the pupil reflex (A)</p> Signup and view all the answers

How is the final reading for refractive error determined?

<p>By averaging three different readings (D)</p> Signup and view all the answers

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

<p>Infra-red rays are bounced off from the retina to determine refractive power (A)</p> Signup and view all the answers

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

<p>To adjust the view of the patient's eye on the monitor (B)</p> 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?

<p>Pupil reflex (A)</p> Signup and view all the answers

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