Lenses, not just frames
Wrap Sunglasses and the UV You Still Miss
UV400 on the lens does not cover the gap at the temple. Wrap reduces that leak. A tiny flat fashion lens does not, stamp or not.
Updated 27 Aug 2026 · 6 min read · wrap sunglasses UV protection
Stamp versus silhouette
ISO and ANSI tests measure the lens. Your temple is not in the machine. On open water and high altitude, side leak is a comfort issue and a sensible reason to wrap. On a shaded street, it is optional.
A 8–12mm vertex distance (lens to eye) with a flat lens leaves a corridor of sky. Bring the frame closer and curve it, and that corridor shrinks.
When wrap is worth looking odd
Glacier, sand, long driving into sun, post-procedure days when a clinician said ‘shields.’ Not: a dim museum. A medium wrap with a 8-base curve is wearable in town; a 9–10 base shield is sport.
- UV400 + wrap for all-day open sun
- UV400 + flat fashion for errands
- Unrated wrap is still a funnel — the curve does not invent a filter
Prescription wraps are a lab problem
High wrap plus a strong prescription needs decentration and a lab that knows 8-base Rx. Cheap online wrap Rx is how you get swim and edge blur. Budget $150–$300 and a real PD. Or wear contacts under a non-Rx shield.
Questions, answered
- Do I need side shields for ordinary sun?
- No. You need them for specific medical or glacier use. A larger fashion lens is enough for a city.
- Is wrap worse optically?
- It can be, especially in cheap Rx. Non-Rx sport shields are usually fine.
- Will wrap stop crow’s feet?
- It will cut squint and some side UV on the skin next to the eye. It is not a serum. Wear sunscreen there anyway.
