I recently finished my residency in traumatic/acquired brain injury and now I am getting ready to start my job evaluating/treating soldiers with tbi at an army hospital. I think there are definitely more opportunities opening up for optometrists with this specialty because it is non-surgical and also because we can make a major impact in these patient's lives. The things you'll need (or interests that you should have) to succeed/enjoy this specialty is 1. strong interest/knowledge of neuroanatomy/neurological disease as well as binocular vision/vision therapy/some low vision 2. patience and a warm personality since these patients have been through some very traumatic events and some of them have mood/affect changes because of their condition. In terms of salary, I can only speak for myself but it pays very well probably because there aren't that many people doing it, although I really wouldn't advise going down this path if that is your primary motivation.
I read these forums and some of the people seem very frustrated with the profession, and also some insecurities regarding the refractive focus of our profession, to those people I would like to add my two cents : 1. A large percentage of the patients that I saw during my residency had seen multiple ophthalmologists before coming to see me, they were unable to help these patients with their very significant visual problems because most of them were refractive/oculomotor/binocular/visuovestibular/visual processing based. We were able not only to explain to them why they were experiencing these problems, but we were also able to rehabilitate many if not all of their symptoms and through that they are able to live much more fuller lives. I would also like to point out that most of these patients were referred by MDs and I have even had a few MDs as patients. 2. It is impossible for us to see (and subsequently treat) as much disease (in primary care optometry) as OMDs because they are a referral based practice and we are not, but even with that being said, I find primary care to be rewarding binocular/accommodative problems are much more common than ocular disease and it does have a major impact on people's lives---> ie a person is going to be relieved that you found a retinal tear, but that tear was most likely having a minimal impact on the person's daily life, but if a person has a decompensating esophoria and can't read for more than 10 minutes without a headache and you can fix that, that's a big deal.
I really cannot complain, optometry has been good to me so far and I think that there are great opportunities if you focus on what our strengths are.