Hi. I'm Dr. Rick and I have two decades of ophthalmology experience. I'm online and happy to answer your question today. I am a retina specialist.
First of all, let me make this clear: Your mother will not go blind from her macular degeneration. Yes. It can, and probably will, destroy her central vision and make is so she can not read, see the TV etc but it will not damage her peripheral, or "getting around" vision.
When we say people go blind from macular degeneration we mean "legally blind". This means that there best visual acuity is less then 20/200 (many times at the counting fingers level) but it does not mean that they can not see with their side vision. It is just that they can not do the usual things we associate with seeing, such as reading, driving, watching TV, or seeing faces.
So. If her dementia is advanced, the injections and travel to the ophthalmologists
office etc have been traumatic for her -- and she has missed all her injections since March -- it very will may be that putting her though all that stress is not worth it.
But, that is something only you -- with the help of her ophthalmologist -- can decide.
I would consul you to not take your mother to an optometrist but rather, if possible, back to her treating ophthalmologist. This doctor could not only test her for glasses and vision improvement, but evaluate the current state of her macular degeneration, mental status, physical health etc, and help you to make this very difficult decision for your mom with the best data in hand.
Does this make sense to you?
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Thanks in advance,
Dr. Rick MD FACS