I like to think that a normal co-parenting relationship where both parents have a interest in the kids would have gone like this:
- Child loses his glasses.
- Child comes home and tells the parent who has custody immediately that his glasses have been misplaced.
- Custodial parent tells non-custodial parent. They come up with a game plan.
- Parents confer with the teacher, perform a search of homes and relevant areas of school.
- If glasses are not found as a result of number 4 (and it's more likely they would be as the time between the loss and the search is limited) - the primary caregiver replaces the glasses and provides the receipt to the other parent - who immediately pays his half.