Hi - I was in your shoes 6 months ago - 2.5yo daughter with turning watching TV or tired. She also was prescribed +2.5 ... I cried and cried. BUT, she looks even more beautiful with her specs. I found a retainer that is barely noticeable to keep them on and positioned correctly. See website
www.inconspecuous.com.au. It will keep them safe if her little sister should grab at them too. I have a 19month old too so i understand those fears. I hope your daughter accepts her spectacles as well as my Mia did. Everyone comments on how cute she looks. GOOD LUCK, you're not alone! Megan