I just learned that kids should get their eyes screened as early as 1 or 2. There are diseases that can't be undone after the age of 5! Essentially, if problems are detected early, it is usually possible to treat them effectively. Although they are rare, no harm in checking but there is harm if you don't, so get those little ones checked ASAP.
Thank you @eyebright2020 for educating me and making her visit so enjoyable!