When you power up your system, you may notice a slight glow to the LEDs. For 850nm LED models, you will see a slight red glow. The 940nm models do not have any glow that is visible to the human eye.

Once assembled, the power to the circuit is needed. We have set up this unit to run on 12v DC at about 160mA (0.160A). To operate at other voltages, you must select the correct value of a dropping resistor (of which there are eight).

Aspheric lenses can also improve your peripheral vision. The lens is thinner and lighter, so it can fit better in your glasses frame.Â

The last step is for the installation of the eight current limiting resistors which go at positions R1 to R8. The resistors will stand on their ends for this project. Unlike the LEDs, the resistors are not polarity sensitive to install any way you want.

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A relay lens system is used to convey the image of the object to the eye or, in some cases, to camera and video sensors. A basic compound microscope could ...

Once you have all the parts, the first step is to become familiar with the PCB. It is set up with 24 LEDs in total, 18 around the outside, and another 8 on the inside (the LEDs are labeled D1 to D24). Resistors go on the board at positions R1 to R8, which are between the inner and outer rows of LEDs. Finally, apply power to the board just below D24, where you will see the Positive and Negative solder pads. In the very center of the PCB is a single hole. The hole can be enlarged for mounting or even further to fit around a camera lens.

Aspheric lenses are a great option for strong prescriptions. They give you more comfort, more access to frame styles, and lessen your eye magnification. These lenses can give you confidence and help you feel good about your personal style.Â

Because the curve varies and flattens toward the edge of the lens, aspheric lenses have a larger usable area than regular lenses. This larger area means that aspheric lenses can bend light more efficiently than regular lenses.Â

Aspheric lenses can be more expensive to make, which means your glasses will cost more. You might be ready to pay more if it helps your eyes look less magnified, but replacing your current glasses could be expensive. You’ll likely want anti-scratch and anti-reflective coatings, too, which will add to the cost.Â

While high-index aspheric lenses have a better profile for strong prescriptions, high-index lenses aren’t impact-resistant. They’re more fragile, so you’ll need to be extra careful with them.Â

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Aspheric lenses can fit into most frames, so you can wear almost any style, including rimless or plastic frames. These also avoid distorting the appearance of your eyes and can help you feel confident wearing glasses.Â

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With a flatter curve, there's less central thickness and less eye magnification. They also correct distortion and create a higher-quality image.Â

The simplest way to begin the install is to insert and solder into the board the inner row of LEDs. These are located at D3, D6, D8, D12, D14, D17, D19, and D22. Keep in mind that LEDs are polarity sensitive, so ensure that you align the flat on the LED with the flat on the solder mask on the board. After you have soldered in the first 8 LEDs, trim the leads.

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There are many types of lenses for glasses, including aspheric lenses. Whereas regular or standard lenses have a circular shape, aspheric lenses have a varying curve across the lens. They’re a thinner, flatter, upgraded lens.

To calculate magnification, use the following formula: M (magnification) = the height of the image ÷ by the height of the object. Plug your data into the ...

The cornea and lens bend (i.e., refract) light as it enters your eye and focuses it on your retina. The cornea is fixed, but the lens changes shape as you focus on something close or far away. Your eye or cornea shape, though, can change the way the light bends and cause it to miss your retina or not focus directly on it. These are called refractive errors and can cause blurry vision.Â

When you build your system, you need to decide what frequency of LEDs to install on the board. There are two standard frequencies available, one at 940nm and the other at 850nm. The most commonly used frequency is the 850nm model. Although the 940nm model is more desired for covert operations.

There are drawbacks, though, if you have a strong prescription with significant curvature. With a stronger prescription, your lenses are thicker and heavier and they can make your eyes look bigger. In these cases, aspheric lenses are a good option. Â

Aspheric lenses will make your glasses lighter, thinner, and more comfortable to wear. Thicker lenses are harder to fit into your glasses frame, and they’re more likely to pop out. If this happens a lot, you’re likely to damage your lenses and frames, which can lead to greater expense.Â

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If you have a strong prescription, you’ll need a thick lens to bend the light properly. If you’re farsighted, you’ll need more thickness at the center of your lenses. Your eyes will look magnified and create what’s sometimes called goggle eyes or the soda bottle look. You might feel self-conscious about your glasses and how they make you look, but aspheric lenses can help.Â

We carry both frequencies of the IR LEDs, see our Infrared LED page for models IC601-02 for 850nm and IC401-04 for the 940nm models.

In regular lenses, the light that hits the edge of the lens focuses at a different spot than the light at the center. The result is fuzzy vision in your periphery.Â

Your eye doctor might recommend lenses that are both aspheric and high-index. Where aspheric refers to the lens profile, high-index refers to lens material and thickness. The higher the index number, the thinner the lens.Â

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850nm LEDs produce a very slight red glow when operating, which is visible to the human eye. 940nm models produce no visible light to the eye.

Refractive errors can cause nearsightedness where you see well up close but have trouble seeing farther away. They also cause farsightedness, where you can see distant objects well but not close ones. You can correct these problems with glasses. The purpose is to put a lens in front of your eye that helps focus light directly on your retina. The result is clearer and more comfortable vision.

It’s called a high-index lens because it has a high refractive index, which means light travels quickly through the material. The material bends light more efficiently, making it better at correcting high refractive errors.Â

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Most vision problems occur because of the way light is focused using your retina. The retina is the innermost part of your eye that senses light and helps turn it into three-dimensional images. It works with the cornea, which is the outermost layer of your eye, and the lens, which is an inner part of your eye.Â

Most lenses have a consistent curve that helps bring light to a focus. A concave lens curves inward and helps with nearsightedness, while a convex lens curves outward and helps with farsightedness.Â

We have simplified this process with our online Dropping Resistor Calculator. For this build, we are using 390-ohm one-quarter watt resistors.

Choosing new glasses involves lots of factors, including the type of lens you will purchase. If you have a strong prescription, you might consider aspheric lenses.Â

One question we receive a lot is about building an IR Illuminator. An IR Illuminator allows a camera to see in total darkness. Infrared light can be useful for security applications, or maybe you want to watch the night activities of the local wildlife.

Now you should install and solder in the LEDs at D1, D2, D4, D5, D7, D9, D10, D11, D13, D15, D16, D18, D20, D21, D22, and D23. When installing the LEDs, try to keep them flat against the board.

The IR Illuminator uses our LED SpotLight PCB, which holds a total of 24 LEDs on a circular PCB. The board contains 24 individual IR LEDs that do all of the work, along with eight current limiting resistors. Assembly time for the kit by a novice builder is about 30 minutes total assembly time.

Aspheric lenses change the degree of curve from the center of the lens to the outside. The curve is flatter, so the lens is thinner and lighter.Â

You might want to choose aspheric lenses when you have a strong prescription or you experience dramatic refractive errors. Dramatic refractive errors mean you have significant problems with the way light focuses on your retina, which means you’ll need stronger corrective measures.Â