Most people do not notice a prescription changing overnight. It is usually much less obvious than that. A road sign may look a little softer than it used to. Reading small print might take more effort. By late afternoon, your eyes may feel tired, and you may find yourself squinting without even thinking about it. These changes are easy to brush aside, especially if you spend much of your day on a computer or phone. But when blurry vision or eye strain keeps showing up, it is