Know About Powell Lenses and Achromatic Lenses
Today’s world is full of technology driven wherein usage of computer in one form or the other is unavoidable. Though the usage of computer may not permanently impair one’s vision, but it might cause Computer Vision Syndrome (CVS) which is the complex eye and vision problems that is caused due to the use of computers. When someone work’s on a computer, first they need to adjust to the computer lighting, need to align with the screen and continuously focus on the computer monitor during the work. All these together puts too much strain on the eyes as well as any existing problem in the eye that are not known to the patient and also with the age muscles become inflexible. Some of the symptoms associated with CVS are blurred vision, double vision, red eyes, dry, headaches, eye irritation and neck and back pain. Whether you are using prescription eye glasses regularly or not, it is always ideal to get your eye tests done in case you are working on the computer regularly. The Optometrist will help you in getting either an anti-reflective coating or add tints to your lenses so that you will feel comfortable while working on the computers. The Powell Lenses recommended by Optician, Judy Powell, comes with a light tint to computer glasses that help in reducing the glare from the computer’s overhead lighting and the contrast is enhanced. These lenses help in the elimination of reflections that causes strains to your eyes both from the front as well as at the back as well as eliminates the light emitted from the computer screen that causes glare that results in eye strains. Other than the Powell Lenses, you might even go for some ideal computer settings that are suitable for working long hours along with the screen resolution should be set on high.
Achromatic lenses is defined as a lens with two or three closely spaced or cemented elements that are designed to produce images that are free from false colour. It consists of one element of flint glass and another of crown glass. The crown glass helps in the elimination of the dispersion of chromatic aberration which results in the false images. Achromatic lenses focus the two primary colours red and blue which helps in correcting the chromatic aberration that occurs in between them. Only single focal length value is applied to the entire visible spectrum and the variation is negligible. Mostly achromatic lenses are used in digital photography where they use it in the camera lens system to correct the chromatic aberration to correct the problem of adding false colours to the images.