Regular eye exams are the only way to catch “silent” diseases such as diabetes, glaucoma, and other conditions in their early stages when they’re more easily managed or treated. Many conditions can be discovered in a carefully planned eye exam. Those who consider mass-produced, over-the-counter reading glasses are truly doing themselves a disservice, both financially and medically. One-size-fits-all reading glasses not only do not work well for most people who have a different prescription in each eye, and/or astigmatism, or whose lens and frame parameters are not measured correctly, they bypass the opportunity to have their eyes checked for early detection of many manageable diseases or conditions. For those insisting on selecting glasses not measured specifically for their eyes, headache and eye fatigue are common symptoms.