I think you will find Ernest that you are required to remove glasses for a passport photo anyway, although I stand to be corrected.
As has been said before you do indeed seem to have an agenda about Manchester. However having been to over 200 airports in my time I have to say there are very few that do not require walking, I do not think Manchester is any worse than most.
As has also been pointed out the 'Border Force' is nothing to do with the airport it is an agency of the UK Government, if there were delays it is their staffing issue not the airports.
If you do indeed have a mobility problem it is no issue to arrange assistance.