Most aspheric lenses also are high-index lenses. The combination of an aspheric design with high-index lens materials creates a lens that is noticeably slimmer, thinner and lighter than conventional glass or plastic lenses.

Apple’s cloud service for security cameras has many great features, including the price—but we don’t recommend it for most people.

Lenticularlens

This camera delivers high-resolution images and can distinguish between people, pets, and motion, a feature usually available on high-priced models.

Whether you are nearsighted or farsighted, aspheric lenses are thinner and lighter and have a slimmer profile than ordinary lenses.

A smart doorbell camera allows you to see who’s on the other side of your front door so you can screen visitors and package deliveries—even if you aren’t home.

Aspheric plus lenses can be made with much flatter curves, so there is less bulging of the lens from the frame. This gives the eyewear a slimmer, more flattering profile.

Whether you are nearsighted or farsighted, aspheric lenses are thinner and lighter and have a slimmer profile than ordinary lenses.

The Eufy IndoorCam C120 captures 2K images day and night, a massive upgrade from 1080p resolution, which has long been considered the gold standard. It can detect motion, tell the difference between people and pets, and even hear crying. You can store clips in one of four ways, including locally on a microSD card or NAS (network-attached storage, which you can set to capture just motion-triggered events or to record everything 24/7) and in the cloud via a paid subscription to Eufy Cloud or Apple HomeKit Secure Video. The C24 is also the least expensive, best-performing camera we’ve reviewed that supports Amazon Alexa, Apple Home, and Google Home.

Aspheric lenses have a slimmer profile for virtually all prescriptions, but the difference is especially dramatic in lenses that correct high amounts of farsightedness. Lenses that correct farsightedness (convex or "plus" lenses) are thicker in the center and thinner at their edge. The stronger the prescription, the more the center of the lens bulges forward from the frame.

For several reasons, frame selection is important with aspheric lenses. In general, the best-looking eyewear results when the frame is not overly large and when the eyes are centered in the middle of the frame opening. Your eye doctor or optician will help you select the best type of frame to complement your new aspheric lenses.

A good home security system should make it easy to find peace of mind. It can alert you to an open door or window, frighten away prowlers, and call for help.

Aspheric lenses, on the other hand, have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge.

Also, the Nest doorbell isn’t compatible with the old Nest app since newer Google products have switched to using Google Home. However, useful Nest app features like the ability to “favorite” the doorbell so you can view the live feed upon opening Google Home have made the transition easier.

GRINlens

Rachel Cericola is a writer covering smart home. In addition to testing hundreds of smart devices, she has also tested dozens of ice cream sandwiches.

The Google Nest Doorbell was the most accurate when it came to identifying types of motion (person, animal, vehicle, or package), and reacted quickly when sending smartphone alerts and displaying live views. The image resolution is only 960×1280, which is lower than our other picks, but the picture is clear, and the low-res actually ends up being easier on your Wi-Fi network to allow for smoother streaming. Audio was always clear on either end, with adjustable volume and the ability to switch off the microphone when necessary. While it offers free cloud storage, you’ll only be able to access footage from the past 3 hours . If you want to keep it longer, the Nest Aware plan (starting at $8 per month or $80 per year) can store video up to 30 days, and adds in Familiar Face Detection. In addition, if you want 24/7 recording to the cloud, you’ll have to shell out $15 a month or $150 annually for the Nest Aware Plus plan.

Corrective lenses

Fresnellens

I write about everything from smart lighting and home security to Wi-Fi cameras and smart bird feeders. I’ve also covered ice cream sandwiches, robot vacuums, and snoring.

Advanced optical design technology allows aspheric eyeglass lenses to be made with flatter curves than conventional lenses, giving them a slimmer, more attractive profile.

Aspheric lenses greatly reduce these undesired magnification and minification effects, so the world looks more natural to the wearer, and the wearer's eyes look more natural to everyone else.

This cord-free camera offers excellent battery life, the option to store recordings locally or in the cloud, and the best array of customizations for the money.

Asphericallens

The E340 supports both Amazon Alexa and Google Home, but currently Google Home only supports voice control of the light and doesn’t allow manually tweaking it using the app.

You should occasionally clean your Wi-Fi cameras to keep them free from dead bugs, water stains, and other debris that might alter their function.

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Conventional lenses for nearsightedness do just the opposite: They make things look smaller and give the wearer's eyes a small, "beady-eyed" appearance.

The Eufy Floodlight Camera E340 combines a bright outdoor LED light with two surveillance cameras: one with a 2K telephoto lens and the other a 3K resolution wide-angle camera. The E40 can survey a far greater area than other models because both cameras can pan and tilt 360 degrees horizontally and 120 degrees vertically. Both cameras can track and follow motion well, capturing clear images day and night—both with and without color night vision. Video can be stored internally on a removable microSD card (up to 128 GB), to the HomeBase S380 hub (sold separately), or in the cloud (if you opt for a subscription; they start at $3 per month). Two integrated LED panels capable of blasting 2,000 lumens of brightness can be turned on and off or tweaked via the Eufy app or voice control.

Opticallens

It also makes it possible for someone with a strong prescription to wear a larger selection of frames without worry of the lenses being too thick.

People who want to keep tabs on what’s going on inside, whether they’re checking in on kids and pets or watching for unidentified houseguests.

Wi-Fi security cameras let you keep tabs on packages outside your home, pets on the couch, and even prowlers raiding your refrigerator. We’ve done hundreds of hours of research and testing on outdoor, indoor, hardwired, cordless, and doorbell Wi-Fi cameras, searching for the best models to fit a variety of homes, budgets, and security needs. If you want to know what’s going on when you’re away, one of our camera recommendations will do the job.

Eyeglass lenses that correct myopia (concave or "minus" lenses) have the opposite shape: they are thinnest at the center and thickest at the edge.

People who want a permanently installed way to screen visitors at the door, whether they’re on the other side of the door or the other side of the world.

Creating the complicated curves used in aspheric lenses makes these advanced lenses a bit more expensive than conventional lenses. But the outstanding cosmetic and visual benefits of these thinner, lighter lenses make them a good investment.

At $3.50 per month per camera, the cloud service is competitively priced. However, the price continues to increase when you add cameras, $7 for two cameras, $10.50 for three, and $12 for up to 10.

Though the slimming effect of an aspheric design is less dramatic in minus lenses, it still provides a noticeable reduction in edge thickness compared with conventional lenses for myopia correction.

Similar to all Eufy cameras, this model downgrades 2K footage to 1080p and 3K footage to 2K when it is uploaded to the cloud. Still, we always recommend cloud video storage for security reasons—if someone steals or damages your camera, you don’t lose your recordings—and in real-world use, we noticed a drop in image quality only when we deliberately compared videos side by side (and it’s still of good quality).

Aspheric lens designs, on the other hand, reduce or eliminate this distortion, creating a wider field of view and better peripheral vision. This wider zone of clear imaging is why expensive camera lenses have aspheric designs.

Taking measurements for aspheric lenses requires greater care and skill on the part of the optician, but this requires only an extra minute or two.

The Familiar Face Detection feature (a feature that “recognizes” and names frequent visitors) included with the Nest Aware subscription can be faulty. It needs a good look at your visitors to work properly–and even then it still gets some wrong, but you can correct it.

Although this model has color night vision, I found it to be grainier than other models we tested—and turning it on drained the battery faster. I recommend relying on the camera’s standard black-and-white night vision, which delivers a better picture.

This hardwired floodlight has two pan-and-tilt HD cameras, and it stores video internally for free or in the cloud with a subscription. Its bulb is light but dimmable.

Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball.

This doorbell captures clear audio and video, sends fast alerts, and offers free and paid cloud storage—including an option for 24/7 recording.

Because aspheric lenses have flatter curves than conventional lenses, they fit closer to your face. This is a major benefit for anyone wearing a strong correction.

Wirecutter is the product recommendation service from The New York Times. Our journalists combine independent research with (occasionally) over-the-top testing so you can make quick and confident buying decisions. Whether it’s finding great products or discovering helpful advice, we’ll help you get it right (the first time).

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People who want the sense of security that comes with motion-activated lighting, along with the additional assurance of recorded or live video. The built-in LED also makes video images brighter.

Since aspheric lenses are flatter and positioned slightly closer to the face than conventional lenses, some wearers may notice more reflections off the front and back surfaces of the lenses. For this reason, anti-reflective coating is highly recommended for all aspheric lenses.

We have completed a new round of testing and have a new indoor security camera top pick, the TP-Link Tapo C120. This roundup will be updated soon with full reviews.

Conventional spherical lenses with a strong prescription for farsightedness cause unwanted magnification. This makes objects appear larger and closer than they actually are. And because this magnifying effect goes both ways, conventional lenses for farsightedness also give the wearer's eyes an unnaturally magnified, "bug-eyed" look.

The TP-Link Tapo Wire-Free Magnetic Security Camera is relatively inexpensive compared to our other picks yet captures clear 2K video and includes a long-life internal battery so you can install it anywhere within reach of your Wi-Fi signal. You have the option to store video for free, using local video storage via a microSD card, or using a paid cloud subscription which enables 30 days of storage for $3.50 per month (or $35 per year for one camera). With or without a subscription AI detection is enabled—not all cameras include that—so it can distinguish between various motion triggers including, people, vehicles, and pets. To limit the volume of nuisance recordings you can create Activity Zones that tell the camera what it should and shouldn’t record—for example, you might have one zone triggered by vehicles and animals, and another zone that records only people.

Although the Eufy Solo IndoorCam C24 delivers vivid 2K images for live viewing or recording to a microSD card, it downgrades clips stored on NAS devices and in the cloud to 1080p resolution. In our tests we always found its images to be sharp regardless of the storage method, but if 2K resolution is important to you, opt to use a microSD card.

With conventional lens designs, some distortion is created when you look away from the center of the lens — whether your gaze is directed to the left or right, above or below.

Aspheric designs are available in single vision lenses for the correction of nearsightedness, farsightedness and astigmatism, and in progressive lenses, bifocals and trifocals for presbyopia. Although most aspheric lenses are made from high-index materials, they are available in regular plastic, too.