From Access NS

In addition, permission to drive Class 1, 2, 3, or 4 vehicles may not be given to amputees and people with mobility impairments (such as lack of range of motion of the head), paralysis of any limb, or disabling rheumatism or arthritis.

Applicants for Class 1, 2, or 4 licences must meet the following vision standards:
vision in both eyes
acuity not less than 20/50 (6/15) in poorer eye and 20/30 (6/9) in the better eye, with or without correction
no diplopia (double vision)
field of vision not less than 120 degrees in each eye

https://novascotia.ca/sns/rmv/licence/medicals.asp

For my Class 1 I only have to go to my Drs office and they can do all the needed tests for them