The most familiar type of telescope is the refractor. It uses two lenses, one to collect the light and form an image, called ...

The most familiar type of telescope is the refractor. It uses two lenses: one to collect the light and form an image, called ...

The performance of visual functions decreases as one ages. With at least two billion people affected globally, presbyopia is ...

Using the marker, draw a shape for your magnifier onto the cardboard big enough to hold the lens. Think about circles, hexagons, and diamonds. Glue the lens onto the cardboard, aligned with the ...

Buying contact lenses online comes with a few key benefits that you don’t get from in-person shopping: It’s more convenient and faster, and the contacts are typically cheaper than buying at ...

Executive Editor David Carnoy has been a leading member of CNET's Reviews team since 2000. He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio ...

The best lenses for astrophotography enable you to capture the stars at the highest quality possible. Our roundup includes models for all leading camera brands. You'll want to own one of the best ...

Convex optimization problems arise frequently in many different fields. This book provides a comprehensive introduction to the subject, and shows in detail how such problems can be solved numerically ...

The best iPhone lenses are a sure fire way to take your iPhone photography up a level. Sure, the iPhone 15 Pro has a 48MP sensor, which sounds great on paper, right? Well, ask any professional ...

If you are squeamish about your eyes, look away now. But if you’re struggling with your vision, or have cataracts, is lens replacement surgery really a safe option? Also known as refractive lens ...

It’s impossible to choose just one Sony lens to recommend: from wide-angle primes to super telephoto zooms, there’s E mount glass for any situation. The hard part is choosing the right one for ...

Nasha is a Managing Editor for CNET, overseeing our sleep and wellness verticals. She is a nutrition, mental health, fitness and sleep science enthusiast. Her passion for mindful and holistic ...