Low Vision Flashcards
MaxDetail device is useful for what activity?
Computer work
* 2.2x spectacle mounted device that focuses at intermediate distance
* comes in a clip-on version to put over glasses
What are Hand Held Telescopes used for?
Spot viewing distance objects
Commonly used for viewing scoreboards at sports games.
What is the purpose of Center Fit Spectacle Mounted Telescopes?
Prolonged distance viewing
Used for activities like watching movies.
What are Bioptic Telescopes mounted on?
Patient’s glasses
Used for spot viewing while driving and require thorough training.
What type of glasses are High Plus Readers?
Reading glasses with a high add power
Require BI prism due to high convergence demand.
How is BI Prism calculated for each eye?
Dioptric Power of the Lens + 2D
Example: Lens Power OD and OS is +8, Prism = 10BIA.
What is the main use of Hand Held Magnifiers?
Spot reading
Commonly used for reading food labels.
Do Hand Held Magnifiers require the patient to wear a near add?
No
Patients must learn to hold the device at the proper working distance.
What is a Collimating Magnifier?
A plus lens with an object at its focal point
Creates parallel light, eliminating the need for accommodation.
How is magnification calculated for a Collimating Magnifier?
Dioptric Power of the Lens/4
Distance is assumed to be 25 cm.
What do Stand Magnifiers require from the patient?
Wear a near add
The object is placed within the focal length of the lens.
What type of reading do Stand Magnifiers provide?
Stable viewing for continuous reading
Typically used for reading books.
What is a drawback of Stand Magnifiers?
Reduced field of view
Objects are placed within the focal length of the lens.
What type of magnification do Stand Magnifiers use?
Conventional Magnification
Necessary due to the positioning of the object within the focal length.
Which low vision device is attached to pt glasses to allow for intermediate viewing?
Tele-microscopes/spectacle mounted magnifiers
* poor cosmesis and heavy
