Telescopes for Low Vision

Telescopic lenses for low vision patients can be very useful for those who need different levels of magnification for different types of tasks without having to use multiple pairs of glasses.

What Exactly are Telescopes for Low Vision?

Low vision can be very frustrating for patients as it impacts their ability to perform a wide range of tasks in their daily lives. Fortunately, there are tools to help regain that ability, such as telescopes.

Telescope glasses are another way to help low vision patients partake in the activities they want to do more easily, by enabling them to use the same device for different distances.

The magnification from standard corrective lenses requires things to be viewed at a specific focal length, which can be ill-suited to certain tasks which must be done at a specific distance, whether near or far, such as reading, looking at screens, cooking, or viewing traffic signals. Telescopic aids provide the wearer with a way to quickly adjust the level of magnification needed according to the distance.

Telescopic glasses for low vision can be either focusable or fixed-focus. Focusable glasses can be adjusted on their own, while fixed-focus glasses use reading caps meant for specific distances.

Amplify Eyecare of Greater Long Beach

Types of Telescopes for Low Vision

There are two main types of telescopes for low vision patients: Galilean and Keplerian Telescopes

Galilean Telescopes

Galilean telescopes are made up of 2 lenses. The objective lens, which is a convex (plus) lens, which is close to the object you are viewing, and the ocular lens, which is a minus lens and closer to the eye.

The amount of distance between the two lenses is determined by the differences in their focal lengths so as to produce a real image. When compared to Keplerian telescopes, Galilean telescopes are lighter, shorter, and cheaper, which also makes them a good first-choice for children

For patients with peripheral field loss, these are also ideal, though in those cases the lens order is reversed to provide a wider visual field.

Keplerian Telescopes

Keplerian telescopes, which are also known as prismatic or astronomical telescopes, are optical systems which use two convex (plus) lenses. In these telescopes, the objective lens is of a smaller diopter power than the ocular lens, and the distance between the two is the sum of their focal lenses. While this produces a real image, it ends up inverted, requiring a prism to reverse the image. This makes Keplerian telescopes longer, heavier, and more expensive, but they provide a larger visual field and better optical quality than Galilean telescopes.

Specific Telescope Configurations

Beyond the two basic types of telescopes, they can be configured in a wide range of ways for different patient needs. 

Some of these configurations include:

Reading Telescopes: Reading telescopes are specifically designed to allow the wearer to see a magnified view of an entire column, allowing them to see more words at a more comfortable reading distance.

Full Diameter Telescopes: These telescopes are designed for distance tasks performed while the wearer is stationary, such as watching TV. Due to their level of magnification, attempting to walk while wearing them would be like walking while staring through binoculars, which is not advised.

Specific Telescope Configurations
Specific Telescope Configurations

Specific Telescope Configurations

Bioptic Telescopes: These occupy more of a middle ground, and provide assistance with distance vision while allowing movement, thanks to the higher placement of the telescopes.

Spiral Galilean Telescopes: This design provides focusing ability to galilean telescopes, allowing the wearer to have greater flexibility of use without requiring reading caps.

Spiral Expanded Field Telescopes: These keplerian telescopes maximum flexibility, allowing greater focusing and visual field options.

Additional Telescope Variants

There are different telescope types in regard to how they are utilized, such as hand-held, spectacle mounted, and clip-ons.

Hand-held telescopes are simpler, lighter and cheaper, and are best suited for short activities or for children. One disadvantage of handheld telescopes is that they require prolonged holding of the object, which can be physically exhausting for some people. 

Spectacle mounted telescopes provide the advantage of being hands-free, and are better for tasks that require more attention to detail. However they generally are higher cost than handheld.

Clip-ons share the advantages of both previous types, especially in regards to weight, but they can reduce visual field somewhat and scratch the lenses if you aren’t careful.

Specific Telescope Configurations

Monocular vs Binocular

Another distinction between types of telescopes is between monocular and binocular types. Monocular telescopes are ideal when there is a significant difference in visual acuity between the two eyes. Less expensive, lighter, and more discreet, monocular telescopes can be used with the dominant eye. 

Where there is a similar visual acuity in both eyes, binocular telescopes are preferred for increasing the visual field. Though these do weigh and cost more.

Dr. Ikeda cartoon

Summary

Telescopes can be a tremendous help for patients with low vision. Due to the different varieties, however, it is highly advised that low vision patients schedule a low vision eye exam with a low vision doctor before purchasing telescopes, or any low vision aid. If you have low vision and would like to schedule a consultation at Amplify EyeCare of Greater Long Beach, you can contact us at (562) 925-6591.

 

Testimonials


  • I haven't actually used the optometrist side, so my review is limited to the vision therapy offered.  This office was recommended by my occupational therapist for the treatment of my double vision following a stroke.


    Claire A.

  • Love this location. I had a brain injury accident from day one one. All the team make you feel you still important and hope in the horizon after when the medical system fell you miserably. Dr. Ikeda very professional and very understanding about your issue. Two tombs up.


    Jim K.

  • My husband and I were immediately impressed with Dr Ikeda. I was hit by a car while cycling which caused broken bones and three brain injuries. The brain injuries caused double vision. Dr. Ikeda examined my eyes and got me started on vision therapy with his occupational therapist who specializes in vision therapy.  She (Chris) is absolutely great.  I am impressed with the array of tools used to help recover my binocular vision.  I am doing things I never thought were possible (balance boards etc).  Chris pushes me and keeps me motivated. I really enjoy my sessions with her.  The office staff is always friendly and they have a wonderful appointment reminder tool that makes it easy to keep my calendar up to date. I am happy the rehab center at Little Co. of Mary recommended them!!


    Teresa S.

  • The Vision Therapy is handled in a separate office through a different door from the shared waiting room. Chris, the vision therapist, has a wide and varied assortment of tools, equipment and resources to best evaluate and treat most vision issues. After just a few visits, my double vision became easier to control, using exercises developed during the therapy process. It was time well-spent.


    Joe M.

  • I have been coming here since I can remember. I love it here. The staff is so amazing and nice. They explain everything they gonna do and never make you feel rushed. Dr. Ikeda has always been my doctor and I would never want another one. He is the doctor for my whole family and is always asking how everyone is doing. I am also so crazy about picking out my frames and have to try so many and each person who helps me take the time and lets me try them all on. I would never want to go anywhere else! I definitely would recommend this office to anyone looking for a great eye doctor.


    Kayla W.

Blog

Lighting-Assessment---Intensity-1

Lighting as Part of A Low Vision Evaluation

A low vision evaluation is in some ways similar to a regular eye exam, and in other ways entirely different. […]

Read More
josh-applegate-p_KJvKVsH14-unsplash

Can ADD/ADHD be a Vision Problem?

According to a study, approximately 20% of 4.5 million children currently identified as having ADHD may have been misdiagnosed. Furthermore […]

Read More
pexels-monstera-6186146

Are all magnifiers the same? The difference in optics between handheld magnifiers

Hand magnifiers are hand-held devices that can be placed over an object or text to enlarge or magnify what you […]

Read More
see all blogs

Contact Us To Amplify Your EyeCare

Amplify EyeCare of Greater Long Beach Logo

Working Hours

Monday & Wednesday
9:00AM–6:00PM

Tuesday & Thursday
8:00AM–5:00PM

Saturday
By appointment only

Friday & Sunday
Closed

 

 

Location
16816 Clark Ave, Bellflower, CA 90706, United States
Fax
(562) 867-8719
Website Accessibility Policy
Safety protocols page
privacy policy
Cancellation Policy
For Patients
appointment
Call Us
Referrals
Assessments
For Patients
appointment
Call Us
Referrals
Assessments
eyefile-adduserphone-handsetcalendar-fullarrow-uparrow-right linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram