aging eyes anti glare reading lenses bifocal vs progressive readers computer vision syndrome diabetic vision changes digital eye strain diopter chart early signs you need new glasses eye exam frequency find your magnification how often to update prescript How Often Should You Update Your Reader Strength? TL;DR: Your eyes are living systems that change with age, health, and lifestyle. Reader strength usually increases every few years after 40, but sudden or uneven changes may signal bigger issues. This guide explains why … Team Debby a month ago