The Complete Home First Aid Kit Checklist (2026)
Everything a well-stocked home first aid kit should contain, plus how to store it and when to restock. Printable checklist included.
Quick answer
Start with fit: use the three numbers on a current frame's arm (lens width, bridge, temple length) to find frames that fit, then choose a shape that contrasts with your face shape. You'll need an up-to-date prescription and your pupillary distance (PD) to order prescription lenses online.
Buying glasses online is easy once you know your measurements. Here's how to get a comfortable fit and a style you'll love.
Read the numbers on your frames
Look inside the arm of glasses that fit you well. You'll see something like 52□18-140:
- 52: lens width in mm
- 18: bridge width (the gap between lenses)
- 140: temple (arm) length
Choose new frames within about 2 mm on lens and bridge width, and 5 mm on temple length, and they'll likely fit similarly.
Match frames to your face shape
- Round face: angular or rectangular frames add definition.
- Square face: round, oval or cat-eye frames soften strong angles.
- Oval face: most shapes work, so experiment.
- Heart-shaped face: bottom-heavy, rimless or cat-eye styles balance a wider forehead.
What you need to order prescription lenses
- A current prescription (most are valid for 1–2 years)
- Your pupillary distance (PD), which is sometimes on the prescription. Otherwise ask your optician or measure it carefully.
- Lens options: anti-reflective coating is worth it for most people. Consider high-index lenses for strong prescriptions.
Do blue-light glasses work?
The American Academy of Ophthalmology doesn't recommend blue-light-blocking glasses for digital eye strain, because screens aren't shown to damage eyes. Eye strain is better helped by the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. Some people still like the tint for comfort.
Are smart glasses worth it?
Smart glasses add cameras, open-ear audio and voice assistants to a normal-looking frame. They're great for hands-free calls, music and quick photos. Check battery life, whether prescription lenses can be fitted, and be considerate about recording people in public.
Online glasses don't replace eye exams. Regular exams check eye health, not just your prescription.
FAQs
What do the three numbers on glasses mean?
Lens width, bridge width and temple length in millimetres. For example, 52-18-140 means 52 mm lenses, an 18 mm bridge and 140 mm arms.
Can I buy prescription glasses online?
Yes. You'll need a valid prescription and your pupillary distance. Choose frames close to the measurements of a pair that already fits you.
Medical disclaimer: This article is for general information and isn't a substitute for professional medical advice, diagnosis or treatment. Ask a qualified clinician about your situation. Some links are affiliate links; see our disclosure.