Lens Ultra Violet
Special Effects for Your Eyes With Color Contact Lenses
The looks of a person can be enhanced to make a world of difference in coordination with the garment worn, thanks to the color contact lenses. Color contact lenses are merely for aesthetic purposes and are cosmetic accessories and are not for medicinal values and therefore, should be used only for a limited period of time.
Basically color contact lenses are of two types, disposable and extended wear. The former type is used only for about a week or so and the latter, up to a year and longer, depending upon the usage. Although there are many varieties and colors in color contact lenses, blue is the most popular among them all. There are light filtering tinted lenses for athletes and sports persons.
But it should be ascertained whether the contact lenses come from an optical outlet that is licensed and should be safe. Also, the color contact lenses must not have a negative impact on the vision of the wearer and must not block the vision and give a hazy look.
Color contact lenses can either be color enhancers which, as the name indicates, enhance the light color of the eyes and make them look richer and deeper. Or they can be color changers which are specifically designed to work with dark eyes, that prevents the initial color and give a new shine to the eyes. There are specialty lenses also that are meant for special effects and are called novelty contact lenses. There are opaque lenses that entirely change the color of the eye.
When taking into the consideration the safety aspects, it is important that the color contact lenses are purchased under the prescription of a medical practitioner and is from a reputable manufacturer. This is due to the fact that color contact lenses do not allow oxygen to pass through them and so should not be worn for more than six or eight hours a day and must not be worn while on sleep.
Color contract lenses are manufactured to look as natural as possible, even with a series of small colored dots on the lenses but the centre is left as such for clear visibility. As always, color contact lenses should be cleaned in a contact lens solution approved by the FDA and the quality should never be compromised.
Some of the color contact lenses are available with inbuilt ultra violet radiation protection to safeguard against the harmful sun's rays. Color contact lenses have come to stay just like a facial, skin treatment or hair fashion. Color contact lenses, undoubtedly, help to change the complete look of the person and are preferred by those who want to have an adventurous life and make them noticeable and give an effective appearance.
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How do I rig up some LED lights to a battery source and switch?
I want to put some LED lights into something. Basically I just want the lights to run on battery power (AA, AAA, or 9V), and have either a toggle or momentary switch to turn them on/off (haven't decided yet). I have essentially no electrical experience.
I have ordered the LEDs themselves. They also come with free resistors (it says they "work for 12v"). What other items do I need, and how do I put this together? Will a soldering iron be required?
Here some of the LED specifications:
Emitted Colour : Ultra Violet UV
Size (mm) : 5mm ( Flat Top )
Lens Colour : Water Clear
Peak Wave Length (nm) : 405 ~ 410
Forward Voltage (V) : 3.2 ~ 3.6
Reverse Current (uA) : <= 30
Luminous Intensity Typ Iv (mcd) : 2000
Viewing Angle : 85 ~ 100 Degree
Gosh! that's too much specifications for a simple battery powered LED indicator with a switch. The specifications are required when you are designing serious circuits. Don't worry about them for now.
If the company provides you with resistors you don't have to then worry about calculations. You could connect the LEDs in series or in parallel (series helps in dropping voltage current flowing remaining constant, parallel helps in same voltage fed, current varying depending on consumption of each LED). Resistors are used to limit current. A switch is always in series from the battery (a device used in place of breaking or making a connection).
You may need a soldering gun with lead and flux as well as a cutter and nose plier to put them in order. (LEDs have polarities like batteries). It is safe to work on 3 V inputs and making connections, nothing goes wrong with these devices even if you connect them in reverse (only they don't work). ONLY IT IS IMPORTANT YOU DON'T DIRECTLY SHORT THE external LEADS OF THE BATTERY.
Use Ohm's law that is very simple to check the current limit and voltage drop by the LED. Resistor in Ohms equals Voltage in volts divided by current in amperes. Use algebra to manipulate: R=E/I. It does help if you have a soldering iron and a cutter and a nose plier.
Dyskinesia and Blue Lenses
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