Can I put in prescription lens in these

yes, you can replace them with prescrition lens at optical store.

Are these square sunglasses for women or men, or both?

The Square sunglasses are unisex. Women or men can wear these shades when travelling, shopping, walking, hikng,fishing, parties or other outdoor activities. The brand designer sunglasses are high grade, long-time guarantee and are fashionable in 70s,80s,90s,00s. They are your best gift for Father's Day.

I have a wide face, will these square oversized sunglasses work?

I also have a wide face, but these oversized sunglasses fit beautifully! They're large lenses and the hinges can be adjustable with screw as your request. The oversized lenses don't make me look like I'm wearing a pair meant for a child. I loved the first pair so much.

I am trying to get some for fishing, has anyone bought them and fished? Do they work well?

The square oversized sunglasses are great eyewear. Of course, you can wear them for fishing, walking, party, taking photos and all outdoor activities. The lens are UV400 protection and can filter out glare from reflecting surfaces and restore a colorful world in your eyes. However, I do like the way they perform outside--the oversized and square frame, the gradient lenses, exquisite nose pad and composite material (metal+plastic). Also, it was so nice to get a hard box, soft pouch and a cleaning cloth. I can take them along using the pouch and it's really save space. I would like to purchase the stylish sunglasses for gifts. Do you see the AVERAGE III? The Iron Man Robert Downey Jr. wear these fabulous sunglasses. That's so cool.