Polarisation: This is a type of filtering that helps reduce reflected glare when sunlight bounces off smooth surfaces like pavement or water. "Lenses with this feature are quite helpful while driving or on the beach," says Shailesh.

Mirror coatings: A thin layer of metallic coating on the lenses can reduce the amount of visible light coming into the eyes. These are good for high-glare environments.

Gradient: These lenses offer different shading levels. For example, those that are dark on top and lighter at the bottom reduce glare from the sky, but let you see clearly below. These are good for driving, but wouldn't be suitable for the beach.

Photochromic: "This type of lens automatically darkens in bright light, returning to its normal (lighter) shade in low light," says Shailesh.

Impact resistant: Plastic and polycarbonate lenses have less chances of shattering upon impact than glass lenses. "If you purchase polycarbonate lenses, choose ones with scratch-resistant coatings," says Shailesh.