If an applicant is unable to walk 50 metres (55 yards) in total, then their walking ability is not appreciable and they can be deemed as having very considerable difficulty in walking.
Os na all ymgeisydd gerdded 50 metr (55 llathen) i gyd, yna nid yw ei allu i gerdded yn sylweddol a gellir barnu bod ganddo anhawster sylweddol iawn wrth gerdded.