American Board of Ophthalmology (ABO) Practice Exam

The feature commonly added to store-bought reading glasses for comfort is spring hinges. These hinges allow the temples of the glasses to flex outward, providing a more adaptable fit. This flexibility reduces the likelihood of stress on the temples and makes it easier for the glasses to conform to different head sizes and shapes. The enhanced comfort can be particularly beneficial during prolonged use, as it helps prevent the glasses from pinching or applying pressure on the sides of the head.

In contrast, polarized tint mainly serves to reduce glare, especially for sunglasses, and does not directly contribute to comfort. Anti-fog coating helps maintain clear visibility in humid conditions but also isn't related to fit or comfort. Scratch-resistant coating is valuable for durability and protecting the lenses from scratches but does not enhance how the glasses feel when worn. Overall, spring hinges stand out as the feature designed to improve the wearer's comfort during extended periods of use.