Calculating Magnification in Magnifiers
44 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of calculating acuity reserve?

  • To assess the patient's dexterity problems
  • To determine the range of services available
  • To choose the correct telescopes for the patient
  • To ensure prolonged viewing is easier and less straining (correct)

    • What happens to the field of view when the magnification is increased?

  • It stays the same
  • It increases
  • It decreases (correct)
  • It becomes unclear

    • What is the purpose of task analysis in non-optical aids?

  • To assess the patient's dexterity problems
  • To choose the correct electronic devices for the patient
  • To determine if the patient needs to hold something (correct)
  • To determine the patient's visual acuity

    • What is the benefit of using higher magnification than the minimum needed for target acuity?

    <p>It makes prolonged viewing easier and less straining</p> Signup and view all the answers

    What is the effect of increasing magnification on working distance?

    <p>It decreases</p> Signup and view all the answers

    What is the purpose of determining the patient's target acuity?

    <p>To determine what the patient needs to achieve</p> Signup and view all the answers

    What is the primary concern when adapting to light from dark in Cone Dystrophy patients?

    <p>Preventing rod bleaching</p> Signup and view all the answers

    What is the benefit of using a large monitor in conjunction with enlargement software systems?

    <p>Increased portion of image visible</p> Signup and view all the answers

    How does increasing illuminance of the light source affect the distance of the task to illumination?

    <p>The distance is halved</p> Signup and view all the answers

    What is the purpose of using angle poised lamps in lighting adaptation?

    <p>To change the adaptive state of the retina</p> Signup and view all the answers

    What is an example of a tactile aid for visually impaired individuals?

    <p>Braille and Moon</p> Signup and view all the answers

    What is the benefit of using Typoscopes?

    <p>To reduce back scatter</p> Signup and view all the answers

    What is the primary advantage of using the lowest magnification necessary to achieve a task?

    <p>To increase the working distance</p> Signup and view all the answers

    What is the formula for calculating the nominal magnification of a hand magnifier?

    <p>M = F / 4</p> Signup and view all the answers

    What is the purpose of considering acuity reserve when calculating magnification?

    <p>To ensure the patient can read fluently</p> Signup and view all the answers

    What is the characteristic of a stand magnifier that makes it difficult to use for patients with arthritis or Parkinson's?

    <p>It is difficult to hold and maintain</p> Signup and view all the answers

    What is the formula for calculating the field of view of a magnifier?

    <p>FoV = y / (Fm x z)</p> Signup and view all the answers

    What is the purpose of a Bar and Flat field magnifier?

    <p>To provide real image enlargement</p> Signup and view all the answers

    What is the primary advantage of using a telescope for low vision patients?

    <p>It is more suitable for intermediate or distance vision tasks</p> Signup and view all the answers

    What is the purpose of adjusting the telescope length for near use?

    <p>To add reading add to the eyepiece</p> Signup and view all the answers

    What is the effect of disability glare on a patient's visual performance?

    <p>It increases contrast threshold</p> Signup and view all the answers

    What is the purpose of using a short wavelength cut-off filter for low vision patients?

    <p>To reduce glare</p> Signup and view all the answers

    What is a key consideration when selecting a non-optical aid for a patient with dexterity problems?

    <p>The patient's ability to hold the device</p> Signup and view all the answers

    What is the benefit of using magnification that is higher than the minimum needed for a target acuity?

    <p>It makes prolonged viewing easier and less of a strain</p> Signup and view all the answers

    What is the relationship between magnification and working distance?

    <p>As magnification increases, working distance decreases</p> Signup and view all the answers

    What is a key consideration when conducting a task analysis for a patient with low vision?

    <p>The patient's need for both hands to be free</p> Signup and view all the answers

    What is the effect of increasing magnification on the field of view?

    <p>It decreases the field of view</p> Signup and view all the answers

    Why is acuity reserve important for prolonged reading?

    <p>It ensures the patient can read for a longer period</p> Signup and view all the answers

    What is the purpose of calculating magnification?

    <p>To achieve the lowest magnification necessary to complete a task</p> Signup and view all the answers

    What is the characteristic of a Galilean telescope?

    <p>It has a cone-shaped design and produces an upright image</p> Signup and view all the answers

    What is the purpose of using a filter to reduce discomfort glare?

    <p>To reduce veiling luminance across the retinal image</p> Signup and view all the answers

    What is the purpose of considering acuity reserve when calculating magnification?

    <p>To ensure that the patient has sufficient visual acuity to complete a task</p> Signup and view all the answers

    What is the effect of increasing magnification on the field of view?

    <p>The field of view decreases</p> Signup and view all the answers

    What is the purpose of using a telescope for low vision patients?

    <p>To meet intermediate or distance vision demands</p> Signup and view all the answers

    What is the purpose of adjusting the length of a telescope?

    <p>To adapt to near or distance use</p> Signup and view all the answers

    What is the effect of disability glare on a patient's visual performance?

    <p>It impairs visual performance</p> Signup and view all the answers

    What is the purpose of using a stand magnifier?

    <p>To provide fixed focus and illumination</p> Signup and view all the answers

    What is the purpose of dark adaptation?

    <p>To improve visual response when going from light to dark environments</p> Signup and view all the answers

    What is the primary concern when adapting to light from dark in patients with Cone Dystrophy?

    <p>Preventing cone bleaching</p> Signup and view all the answers

    What is the benefit of using Large Print text books?

    <p>Increased reading fluency</p> Signup and view all the answers

    What is the effect of increasing the illuminance of the light source?

    <p>The distance of the task to illumination is halved</p> Signup and view all the answers

    What is the purpose of using Typoscopes?

    <p>To reduce back scatter</p> Signup and view all the answers

    What is the benefit of using a large monitor in conjunction with enlargement software systems?

    <p>Increased portion of the image visible</p> Signup and view all the answers

    What is an example of an auditory aid for visually impaired individuals?

    <p>Talking books</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser