I would be curious to see if the optometrist you work for agrees...
Don't skimp on glasses or sunscreen. You'll thank yourself later.
UV protection in lenses is very rarely affected by price, quite a lot of lenses nowadays offer 100% UV protection at very low cost. lens quality is a different matter, I have a few pairs of nice sunglasses believe me I know the difference , I mean I get them at cost so why not. But your eyes can be just as protected by $10 glasses as $200. BTW I always have sun screen on
My thoughts on glasses are derived from personal experience. I take into account many things: UV protection, clarity, weight, etc. I also take lens material into consideration, mostly how long will the glasses stand up to the abuse I put them through.
In my experience the cheaper sunglasses, while they may offer the 100% UV protection, do not stand up to the test of time the way I wear them. If someone goes through a $50 pair of glasses every year (very possible), then it is less of a "value" than my Costas I have had for over three years. I paid ~$130 for them and have beat the crap out of them.
Cheap glasses also tend to tire my eyes out due to the distortion in their glass/poly construction.
"Best Value" is just as subjective with sunglasses as it is with rods, reels, and baits. Like most other topics, to each his own.
You only get one set of eyes. I dont want to chance it with what I have, so I will drop the coin for a pair of the best glasses I can afford.