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If any of their behavior seems to be strange in the future, they can say that they have been rehabilitating from whatever condition they had in the past. To rehabilitate themselves from the Cultural Shock they will inevitably experience, they can then use their funds and identity documents to attend the future equivalent of a College or University.

As @Philipp has mentioned, some may be suspicious as to why they would take so long to correct their handicap, in a world so advanced. I have doubts as to whether 150 years is enough to solve the question of poverty, so they can probably claim that they were too poor to afford treatment. If, however, the world has somehow implemented universal healthcare, in every country, they can use their acting skills to fib. Maybe they were kidnapped by a gang as a child and never got fair treatment. Maybe they were living on that one island that never learned. Maybe they wanted to remain blind because reasons, but the person they love has been diagnosed with a fatal condition, and they got the surgery to see them one last time. A good actor/conman can always figure something out.

If any of their behavior seems to be strange in the future, they can say that they have been rehabilitating from whatever condition they had in the past. To rehabilitate themselves from the Cultural Shock they will inevitably experience, they can then use their funds and identity documents to attend the future equivalent of a College or University.

If they end up waking so far in the future, bio-metrics would likely have dominated the security of the new world. If records of them already exist in the present time, they will need some replacement fingerprints, hair implants, and eyeballs to potentially fool fingerprint scanners, DNA scans, and iris scans.

They will then need to pick up a set of identity papers and records for their new identity, along with identities listing out their disability. Then they will visit a hospital, and 'correct' their disability with their 'newfound' wealth.

If they end up waking so far in the future, bio-metrics may be prevalent to the security of the new world. If records of them already exist in the present time, they will need some replacement fingerprints, hair implants, and eyeballs to potentially fool fingerprint scanners, DNA scans, and iris scans.

They will then need to pick up a set of identity papers and records for their new identity, along with identities listing out their disability. As @cmaster has mentioned, cryptochips or an equivalent, which may be inserted at birth, may also be present as a form of identity verification in the future. In this case, they will have to ask for an implant of a fake chip while they pick up their papers. 

Then they will visit a hospital, and 'correct' their disability with their 'newfound' wealth.

^{and if the world had gone full apocalyptic in 150 years, they would be able to at least make a flashlight or something?}

^{and if the world had gone full apocalyptic in 150 years, they would be able to use the basics to make a talking volleyball as a companion, and perhaps repair a power generator or two.}