Which is better for driving?

The TINHAO. Its 61 x 45 mm wrap-around lenses block more side glare, which matters at the wheel. The Joopin's smaller rectangle lenses let in more light from the sides.

Which fits over larger prescription frames?

The TINHAO is the safer bet. Its 61 mm width and 45 mm height clear bigger frames than the Joopin's roughly 56 x 33 mm lens.

Is the Joopin worth the extra $1.38?

Only if you want the anti-reflective coating and the included leather case and cloth. On lens coverage and price, the TINHAO wins.

Yes. Both are rated UV400 and polarized, so both cut glare and block UVA and UVB.

Neither brand states a warranty. The TINHAO lists an anti-scratch coating, which may help the lens surface; the Joopin's edge is its included case for storage.

Can I wear either over sunglasses?

The TINHAO lists a fit-over-sunglasses design. The Joopin is described for use over eyeglasses, so it is the less certain fit over another pair of sunglasses.

Joopin Polarized Clip On Sunglasses Over Eyeglasses for Men Women UV Protection vs TINHAO Polarized Clip On Sunglasses Flip Up UV400 Protection Anti Glare Lens Wear Over Prescription Glasses

Both are cheap polarized clip-ons that flip up over prescription glasses, so the choice comes down to fit and lens size. The TINHAO is $9.99 at Amazon and has larger lenses (61 mm wide, 45 mm high) in a wrap-around shape, which suits wider faces and driving or cycling. The Joopin is $11.37 at Walmart and uses a smaller rectangle lens (2.2 in wide, 1.3 in high) with an anti-reflective coating. Buy the TINHAO for bigger coverage at a lower price; buy the Joopin if you want a flatter, less wrapped look or the anti-reflective coating.

Today the TINHAO Polarized Clip On Sunglasses Flip Up UV400 Protection Anti Glare Lens Wear Over Prescription Glasses costs $1.38 less at its best price.

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