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(Some studies suggest that overexposure can damage the retina and increase the risk of age-related macular degeneration and cataracts. Blue-light-blocking coatings ($30 to $180) are said to reduce exposure to computer screens' LED light.It's helpful if you'd rather not carry separate sunglasses.

Photochromic coating ($50 to $150) darkens in sunlight and shields you from UV rays.

Most lenses already come with this coating make sure yours do.

Ultraviolet protection ($20 to $100) is a good idea for most people because the sun's UV rays may boost the risk of cataracts.

If you have trouble seeing properly when on a computer, driving, and at night, consider them.

Anti-reflective coating ($50 to $100), often bundled with high-index and HD lenses, used to be hard to clean and smudge-prone but now has anti-smudge/anti-fog technology.

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Check the warranty retailers such as Warby Parker will replace lenses that get scratched in the first year after purchase free of charge. Anti-scratch-generally a good idea for all-comes with 95 percent of plastic lenses.Lens coatings are meant to protect your eyes from light or increase lens durability. They can be useful if you wear rimless or semi-rimless frames, or if you're hard on glasses.

Trivex lenses ($200 for single vision, $400 for progressives) are more scratch-resistant than either CR-39 or polycarbonate lenses.

They can be made with CR-39, polycarbonate, or high-index lenses. You might want to opt for them if you have more complex visual problems, such as cataracts or corneal scars.

High-definition lenses ($310 for progressive HD lenses) offer sharper vision and better peripheral vision than standard technology.

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Screen resolution: FPV goggles vary considerably, from basic 320 x 240 pixels, through standard 720p HD to 1080p. IPD isn’t an issue with box-type FPV goggles because your eyes arent each looking at a separate view.

High-index lenses ($150 for single vision, $350 for progressives) are thinner and lighter than CR-39 or polycarbonate lenses, and they will work for even the strongest prescriptions. If you wear glasses, youll probably prefer box goggles, most of which allow plenty of space.Pricier than bifocals ($105), they can be made with CR-39, polycarbonate, or high-index lenses. Consider them if you need glasses for distance and reading and find the split screen of bifocals or trifocals uncomfortable. Progressives ($260) provide a smooth, gradual change in lens strength for seeing well at any distance.