He might qualify for a Health Service voucher if he is receiving certain benefits, but given what we know f his circumstances I'd think that unlikely. One of the major High St chains of opticians here does offer 25% off cost of frames & glasses for over 65s, so he could get a pair for less than £100.
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Good to see such a change in Eric's outlook.
Given Andy's job I'd have expected him to be making suggestions to Eric on the design of the garden, but perhaps that is to come.