New Implantable Telescope Brings Better Vision to those with Advanced Macular Degeneration8:33 PM
|Age Related Macular Degeneration with advanced|
central vision disruption
image credit to eyedolatry.blogspot.com
The CentraSight implantable telescope is made by VisionCare Ophthalmics, and is a vision enhancing device that can improve central vision range when placed inside the eye. Traditionally, patients with central vision loss had to rely on handheld or spectacle mounted telescopes to try to enhance their central vision. These devices were bulky and distracting, not to mention their limited visual potential (about 10 degrees of field is all they can provide!). The CentraSight implantable telescope is just over 4 mm in size and sits discretely in the eye, making it less obvious to those around you that you are using a low vision device, and also freeing up your hands that would have otherwise had to hold the magnifying lens up to the eye whenever you wanted to use it. Because the telescopic optics are inside your eye, there is the added benefit of a much larger observable field of view, between 20 and 24 degrees of gained central vision area is attainable with the implant/
|Enlarged view of the CentraSight implantable telescope. This is actually under 5 mm in size via|
|Implant inside the eye. It is placed in the same place that a post-cataract surgery implant |
would traditionally be inserted via
In October the FDA updated the candidacy needs for patients interested in the CentraSight implant to offer younger patients the opportunity to pursue the implant. The new requirements are:
1) Bilateral Central Vision Loss due to Age Related Macular Degeneration
- If one eye is damaged with macular degeneration but the other still has great preserved central vision, then the patient is not a candidate. The implant needs to be placed on the better seeing eye in order to provide of any improvement in perceived vision. If the implant is put in the bad eye, then the brain will just suppress the bad eye's image and use the good eye only like it was doing before surgery. You would have just had a very expensive surgery without any visual benefit. In order for the telescope to work, your brain has to want to process its image, and that is why it must be placed on the eye with better vision to achieve the best effect.
2) Best Corrected Vision between 20/160 and 20/800
- This telescopic implant will only be beneficial if the patient has advanced vision loss, so vision must be poor in order for the telescopic implant to make sense. The reason that poor vision is so important to achieve success with this surgery is that by putting in the telescope, you are sacrificing all peripheral vision out of the eye with the implant. To give up all of that visual field, you have to have a true need for central vision to make the sacrifice worth it.
3) No prior history of cataract surgery
- When you have cataracts removed, the surgeon places a clear, plastic implant inside your eye to help correct post-operative vision. The telescopic implant is placed inside the eye in very much the same way. The telescope sits inside of the posterior capsule, just like a standard IOL. Once you have a post-cataract implant in place, there are many risks in removing it, so at this time the telescope implant must only be placed in people that have not had cataract surgery and can be fit with the telescopic implant from the very first.
4) At Least 65 years old
- This age limit was just decreased by the FDA (previously the limit was age 75). Since the study results published show that the implant is both safe and effective, the age has been lowered to allow more people suffering from devastating vision loss to benefit.
Some Basics on What to Expect
Before the surgery takes place, your surgeon is going to refer you to a low vision specialist to help you prepare for the type of vision this telescopic implant can provide. The world is going to look quite different after surgery because with the telescope in place, one eye will be responsible for central vision and the other will do all of the peripheral vision tasks. The telescope creates a type of monovision if you think of it in that light. Once the telescope is in your eye, you can't see anything but that central 20 to 24 degrees of field because the telescope is converting all of your available retinal photoreceptors into central vision processing centers. The patient will need practice and coaching to get used to having their eyes see so differently, and before and after implantation there is going to be a learning curve to get comfortable with the new vision provided.
Very little can be done with modern medicine to return lost vision to someone with macular degeneration, but the reason that the CentraSight telescope has been so popular in the news lately is because studies show such promising vision improvement. In the course of one year after telescopic implantation in the better seeing eye, 90.1% of 206 participants had gained 2 lines of letters on a visual acuity test, and 66.6% achieved 3 lines of visual improvement. This improvement in vision can mean the difference in recognizing faces, or living more independently. You aren't going to be driving or reading small font books, but it can make navigating every day tasks much easier and safer.
Dr. Isaac Porter explains the telescopic implant in the video above.
Are you interested in learning if you or a loved one could benefit from the CentraSight implantable telescope? Please head to this website to find a provider in your area, or ask your local eye doctor for a referral to specialist that offers this treatment!