My dm is in her 80s. She has always been very dextrous, knitting, crocheting, sewing etc until her eyesight got too bad. In the past year I have noticed that she uses her fingertips less and less. She seems to be picking small things up with straight fingers. She will close her hand around things in a normal way to hold them, but the picking up itself is straight-fingered. It's as if she's using the sides of her fingers and thumb, rather than the tips. I thought maybe she is losing sensation in her fingertips, so I subtly tested that, but I don't think she actually is. So what is going on? Why would her use change?