There are 4 levels of visual function, according to the International Classification of Diseases -10 (Update and Revision 2006): normal vision; moderate visual impairment; severe visual impairment; blindness. Moderate visual impairment combined with severe visual impairment are grouped under the term “low vision”: low vision taken together with blindness represents all visual impairment.
-World Health Organization
What is Low Vision?
Low vision is the term used to refer to a visual impairment that is not correctable through surgery, pharmaceuticals, glasses or contact lenses. It is often characterized by partial sight, such as blurred vision, blind spots or tunnel vision, but also includes legal blindness.
Many newly diagnosed people are referred to us for a low vision evaluation by a low vision specialist.
The Low Vision Specialist uses functional vision evaluation instruments to assess visual acuity, visual fields, contrast sensitivity function, color vision, stereopsis, visual perceptual and visual motor functioning, literacy skills in reading and writing, etc. as they relate to vision impairment and disability. They also evaluate work history, educational performance, use of technology, quality of life and aspects of psychosocial and cognitive function to determine which adaptive aids and improve the quality of life for the visually impaired.
Low Vision Evaluation
What is a Low Vision Evaluation?
A clinical low vision evaluation assesses whether or not a child will benefit from optical devices such as monocular telescopes and/or magnifiers. An optometrist or ophthalmologist who specializes in low vision and the prescription of optical devices performs the clinical low vision evaluation.
assistive technology to help low vision
Advance Spectacle or Head-mounted Magnifiers
This type of low vision assistive device combines the increased magnification of microscopic view lenses, and a specialized head apparatus for securing the lenses before your eyes. This may be a useful low vision aid for hobbies, reading, and other close-up visual tasks.
Smaller in size, designed to fit comfortably in your hand, the handheld magnifier can be as simple as the traditional magnifying glass and as advance as an electronic low vision magnifier. Models and manufacturers differ on the size, weight, function, and features available, however the electric handheld magnifier is generally designed to be used with ease and provide multiple magnification strengths. This category of low vision assistive devices offers great visual support for individuals with an on-the-go lifestyle.
Portable Electronic Magnifiers
Perhaps among the most versatile (personal to professional life) low vision assistive devices, the portable electronic magnifiers are able to cover a wide variety of tasks. Some portable electronic magnifiers are extremely lightweight and can be used in the home or in the office. These devices are often capable of being positioned in various directions allowing for information across the room to be gathered clearly and displayed on the personal monitor for enhanced viewing. The ability to adjust the camera (responsible for gathering the images or text) may also be self-directed to provide mirror image viewing, helpful when applying make-up or shaving. Beyond the ease of portability and flexibility, some portable electronic magnifiers offer increased option through viewing modes, adding features like contrast, magnification, computer connectivity and more.
Desktop magnifiers, also called CCTV (closed circuit television) magnifiers are more stationary magnifiers. Providing some of the highest levels of magnification power (depending on model and manufacturer), viewing mode options, along with other features, makes these desktop low vision assistive devices more than just an aid for reading.
Hand-held lighted magnifiers can be very helpful.
Pre Footer Background – Set the background color of the pre-footer area directly above the footer.
Footer Background – Set the background color of the footer area at the very bottom of the page.
Footer Text Color – Set the color of the text in the footer.
Footer Nav Font + Color – Set the typeface, font properties, and color of the footer navigation links.
Footer Nav Link (Active) – Set the color of the footer navigation links on hover.
Center Navigation / Info – Choose between left- and center-aligned footer navigation and site info.
Hide Site Info – Hide the site info in the footer.
Meta Priority – Select whether date or category of a post appear above its title in blog list view.
Hide Entry Author – Don't display the byline of a blog post. Useful for blogs with a single author.
Hide List Entry Footer – Don't display the footer (Comment + Like + Share) in blog list view.
Gallery Navigation – Determines the type of gallery image navigation is provided on the page.
Gallery Info Overlay – Select the type of display used for image title and caption.
Gallery Aspect Ratio – Controls the aspect ratio (width:height) for the gallery active slide.
Gallery Arrow Style – Determines the style of the arrows used to cycle through the slides.
Gallery Transitions – select the transition styles used to animate between slides being viewed.
Gallery Show Arrows – choose to use arrows for cycling through slides.
Gallery Auto Crop – choose to auto crop slide images to the selected ratio.
Gallery Autoplay – choose to cycle gallery images automatically without user interaction.
Gallery Loop – Enable a gallery to cycle through to the first slide after the last slide.
Gallery Autoplay Speed –Specify the speed at which the gallery pauses on the active slide.
Gallery Thumbnail Size – Control the height of thumbnail images when used for gallery navigation.
Gallery Arrow Background – Specify the color that is used for the shape of gallery arrows.
Gallery Arrow Color – Specify the color that is used for the arrow itself.
Gallery Circle Color – Specify the color that is used for the circle shape gallery arrows.
Gallery Info Background – Specify the color used in the background of the image title and caption.
Event Time Format – Toggle between 24 hour or AM/PM for event times.
Event Icons – Enable icons on the address and event time display.
Event Thumbnails – Show an image thumbnail in list view.
Event Thumbnail Size – Control the size (ratio width:height) of the event thumbnail image.
Event Date Label – Enable date overlay on top of event thumbnail.
Event Date Label Time – Include the time of the event with the date overlay.
Event Excerpts – Show optional excerpt text of events on the list view when present.
Event List Date – Show the full event date (day, month, year) of the event on the list view.
Event List Time – Show the time range (start time-end time) of the event on the list view.
Event List Address – Show the event location address when present.
Event iCal/gCal Links – Show links to add events to Apple or Google calendars.
Event Like and Share Buttons – Show Squarespace simple like and share buttons on events.
Event List Compact View – Enable a simple stacked view of events in the list view.
Event Calendar Compact View – Enable a simpler calendar view optimized for smaller areas
Product Background Color – sets the color behind the product image.
Product Overlay Color – sets the color of the overlay when product list titles are set to 'overlay.'
Products Per Row – determines the number of products shown per line on the product list.
Product List Titles – controls the position of the product title on the product list.
Product List Alignment – sets the text alignment of the product title on the product list.
Product Item Size – select an image ratio for the product photo on the product list.