Glasses for Every Age, Every Stage.

Generally, anything beyond -6.00 or +6.00 diopters is considered a high prescription, though this varies depending on the type of correction needed (nearsightedness, farsightedness, or astigmatism).

It's on the higher end for reading glasses but not unusual for people in their late 50s or 60s. Reading glasses strength typically tops out around +3.00 to +4.00 for over-the-counter options.

Yes — most people need one to two weeks to fully adjust to progressive lenses, particularly getting used to the correct head position for each viewing zone. Some mild dizziness or a "swimming" sensation in the first few days is normal and usually resolves on its own.

The research on blue-light lenses is mixed — there's limited strong evidence that they prevent eye damage, but many users do report less eye strain and better sleep when wearing them for evening screen use. They're inexpensive enough that trying them isn't a big risk, but they shouldn't be marketed as a medical necessity.

Yes, but mainly in coating durability, lens thinness, and how well progressive lenses handle peripheral distortion. For basic single-vision glasses with a low prescription, the difference is much smaller.

For most people, a 0.25 change is barely noticeable day-to-day. It becomes more relevant if you do detailed close-up work or already have a high prescription, where small changes have a bigger relative effect.

It can be, as long as you have a current, valid prescription and accurate frame measurements (including your pupillary distance). It's less reliable for complex prescriptions — significant astigmatism, high prescriptions, or progressive lenses — where in-person fitting reduces the chance of errors.

Most eye doctors recommend a new eye exam every one to two years, since prescriptions can shift even without noticeable symptoms. Frames themselves can last longer if well cared for, but lens coatings do wear down over several years of daily use.