I wish I could remember the model but I bought one for my Dad after his Glaucoma op many years ago. He was on is own by then and most of his eye drops were missing the eye and running down his cheek. I accompanied him to his post-op check up with (IMO) an extremely brusque and somewhat intimidating consultant. Dad was very in awe of this “great man” possibly being of his generation in his attitude towards doctors and especially surgeons.
So I took a deep breath and explained the problems Dad had been having and showed him the gizmo.
“Nurse!” he bellowed and when she scuttled in he showed her it . “Bloody brilliant!” he bellowed again.”Every patient should be given one”.
“Yes” she replied dryly “I told you that when I showed you one 6 months ago”
Anyway, happy ending, the consultant thawed when he found he and Dad had a shared love of Borders rugby and they ended up chatting like best buddies.
(The eye dropper looked a bit like this, but you could also check Amazon. )