I had the incredible opportunity to wear the Optic Nerve Kingfish polarized sunglasses, during my 8-day Lemosho trek up Mount Kilimanjaro in Tanzania in August 2025. These sunglasses were more than just gear; they were a vital companion at altitudes reaching 5 895 meters, where UV exposure is no joke.

Performance Highlights:
• Perfect Fit: The Kingfish model hugged my face comfortably without slipping, even during long, sweaty ascents.
• UV Protection: My eyes felt completely shielded from the intense sun and high-altitude glare. The polarization was a game-changer for visibility and eye comfort.

• Durability: These shades held up impressively against extreme weather—wind, dust, and sudden temperature drops. Built for the outdoors, no doubt.

Minor Challenges:
• Lens Fogging: When I wore my buff over my nose and mouth, fog tended to collect on the lenses. I hadn’t packed anti-fog spray, which would’ve helped—lesson learned!

• Tinted Window Effect: I noticed faint stripes in the corners of my vision when looking through tinted windows. Not sure of the cause, but it didn’t affect performance on the trail.

Final Verdict:
Despite a couple of quirks, the Kingfish sunglasses delivered where it mattered most—protection, comfort, and resilience. If you're heading into high-altitude or rugged terrain, I highly recommend them. Optic Nerve nailed it with this one.

Love the glasses but are starting to loose the blue mirror coating…. Is there are way to replace? I do ware these all the time and they get wet quite abit.

Great polarized glass for stained water. Used them to musky fish in Canada. Fit and feel were great and like them better than my Costa. Only reason I didn’t give them a 5 star review is because of their performance in low light conditions. I’ll be honest not a-lot of other eyewear is great during this time either and I do have aging eyes.

Great glasses for the price. Kingfish fit me great, glad they're still available as this is my 3rd pair

These lenses actually do everything they say. After months of pretty much daily use, including on water, they don't have a single water-spot. With pretty much just a quick wipe-down, they look brand new again and I couldn't even tell you where my lense cleaner is anymore; don't need it!

I found these in the rocky mountains on a fishing trip. Now the only brand of polarized shades i buy, Kingfish fits my head perfectly and excellent vision in the water!

I love these!! Perfect fit and lightweight on face.

These are my favorite sunglasses! The fir is perfect for a large face. I have ordered four pairs so far.

I kinda feel bad my Costas don't get used any more because these are freaking amazing

These let in the perfect amount of light to yours eyes,👀 not to dark and not to light ,I was always ,either lifting them off my head in shadows,or squinting in bright sun,,,now I can just leave them in place

Just bought my 4th pair of Optic Nerve sunglasses. I use them for running, cycling and just everyday wear. Great value for the money. Well made, durable, and they look good too!

Great local company with great product.

We bought our first pair from a store and the second directly from the brands website. We love the Kingfish sunglasses with the brown lens. Ultimate visibility for bowfishing murky/green waters. It's seriously like having XRAY vision. We have recommended this pair to ALL of our friends that come with us and every bowfishing group we are in on social media!

These are the perfect Florida fishing glasses. The quality for under $50 is unbelievable I never thought I would have a pair of glasses on par let alone better than $300 designer glasses. this was the first time I've bought glasses and didn't have buyers remorse.

Favorite eye wear - wear these everyday

I've gotten about 5000 hot dates with these bad boys on. 10/10

Great optics and durability, five stars

Had to get another pair after I lost my old ones. Couldn't NOT have them

I bought a pair of these on the about 2 years ago during a family vacation at a fly fishing shop. I just needed some relatively inexpensive polarized glasses. I've worn these nearly every day for two years, and they're still in great shape (lens coating has worn a bit, so I bought a few more pairs). I was shocked at how long these have lasted. I though they'd be throwaways after 6 months (max). Impressed and glad I stumbled into these.

These are great glasses for super bright and reflective days. After buying one I went back and bought 3 more. Sadly I've lost most of them. I will certainty be buying more soon.

.This was my second pair of glasses from Optic Nerve. The first pair were the best sunglasses I ever owned. I wanted another just like them but they were no longer made. These are effective as sun glasses but I am disappointed with the color of the lenses; they didn't look purple in the webpage. I am still debating whether to send them back or not.

Love them!! They wrap around my face and block the light from the sides very well while still being very comfortable. I wear them all day around the house doing yard work and them keep them on when I head downtown to go out. Great product and I’ve yet to have a bad experience with Optic Nerve after 3-4 orders. I love supporting great companies with good products. Keep up the good work ON!!

I purchased these sunglasses about 2 weeks ago and I love them. I have very sensitive eyes(even when raining I will have to wear sunglasses) and I love how they wrap around and block the light from the sides as well. They are very light and comfortable to wear. A great purchase. This is my 3 purchase from Optic Nerve over the past few years and I have yet to be disappointed. Keep up the good work!!

Love them, do recommend

These are my fifth pair of sunglasses from ON. High quality product for an amazing price. Used to only wear Oakleys but these are just as good. Love supporting a Colorado company!

Loved the Kingfisher’s polarized lens and fit. Just wished they could swim. Second trip out on the kayak fighting tackle and they bounced off the deck into the water.
Dummy me. 😥

The quality of lens is amazing, and they allow your eyes to "rest" on even the brightest powder day. Colors, especially orange, red pink are greatly enhanced. Sunsets look completely different through these things. Would totally recommend!

Very nice sunglasses for the money. I have purchased three pair of them to keep in various vehicles so that I am never left without them.

Love these sunglasses. Great protection and style.

Excellent company and great service