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How Important is Your Eye Health?

Lack of eyesight can deprive a man from performing some vital activities of life. Tasks like reading are driving are virtually out of question... and living a normal life enjoying all the amenities becomes very difficult. One has to depend on others to perform even the simple task of crossing the road. It's very important that you take proper care of eyes which are your windows to the world. In Eye care lab dot com, you'll get all the information needed on how to keep your eyes healthy and treat eye problems. To take care of your eyes, the first thing you'll have to learn is how they work.

Your Eyes

The most common analogy drawn to the eye is with a camera. It is actually the body's very own camera...its parts doubling up as shutters, films and lenses to give you your vision. The pupil can be compared to the shutter through which light enters the eye. The light that enters the retina sends an inverted image to the brain which then forms the actual image.

This seems rather easy, doesn't it? Anatomically, the eye is much more complex than the normal camera! The eye is made up of several different, minute parts each of which perform different functions, all of which are equally important. The working principle of the eye is a very complex and lengthy process so let's not go into the biology lesson all over again! But the eye consists of several fluid-holding glands each of which is responsible in protecting the eye from physical injuries and providing lubrication without which the eye would run dry.

For example, the tear glands constantly keep the eye wet and also protect it from dust particles that can harm the eye. There is also a complicated system of nerves which send sensors to the brain, and also keep a track on irritating sensations in the eye. The muscles within the eye are also intrinsically connected with the functioning of the eye. All in all, the eye is truly one of the most complicated organs of our body...and the one which requires most protection.

Eye Problems

Like the proverbial "prevention is better than cure", the best cure for blindness is, you guessed it.....to keep it at bay forever. A healthy eye care regime demands regular appointments with an ophthalmologist who can keep a check on any problems and prevent common eye disorders from assuming a greater proportion. Eye care may also include a healthy diet comprising a lot of vitamin A rich foods.

Regular eye examinations also reveal the cause of any vision problems and also determine whether your eyesight requires any kind of corrective measures. Early detection of eye problems can prevent, and cure many diseases, including age related vision problems. The eye problems we've all faced are conjunctivitis and sty...both of which can be really painful and can sometimes be very prolonged. The more serious diseases are glaucoma and cataract that can result in permanent blindness if not operated or treated quickly.

Refractive errors of the eye are very common. They are known as farsightedness, people suffering from which cannot see things which are near, and nearsightedness and individuals having this vision error cannot see far away.

The cause for shortsightedness is that the suffering person from it cannot focus on objects that are far away. The corrective measure of this vision error is simply using a concave lens before the eye. In the same way, longsightedness is when a person cannot see objects that are near. This in turn can be corrected by using a convex lens. Vision disorders after the age of forty which occurs due to loss of elasticity in eye muscles is also very common and is known as presbyopia. This can be corrected by the use of bifocal lenses.

These visual errors and diseases are crucial and need to be treated correctly and before they cause serious damage. Our website will give you all the information you need about better eye care. It also contains articles on contact lenses, eye surgeries...in short, all that you'll need to know about your eyes and their problems. There is also a section on vision correction using laser techniques and laser operating procedures that use the newest, sophisticated laser techniques to treat eye disorders and correct them in a much better way than normal surgery, which is often risky and can result in causing more damage.

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Hubble's View Of The Universe [Part 1]

Hubble's View Of The Universe [Part 1 of 10] THE HUBBLE TELESCOPE Hubble works on the same principle as the first reflecting telescope built in the 1600s by Isaac Newton. Light enters the telescope and strikes a concave primary mirror, which acts like a lens to focus the light. The bigger the mirror, the better the image. In Hubble, light from the primary mirror is reflected to a smaller secondary mirror in front of the primary mirror, then back through a hole in the primary to instruments clustered behind the focal plane (where the image is in focus). THE UNIVERSE Hubble's longest exposures are like a core sample of the universe, recording galaxies at many different distances. This is one of the deepest core samples ever taken. It shows a few nearby stars in our Milky Way galaxy. The rest of the objects are distant galaxies, extending from 1 billion to over 10 billion light-years away. STARS Stars live and die over the course of millions to billions of years. It is unusual to see changes in individual stars. To learn more about them, we must piece together snapshots of stars at different life stages — from birth to death. The birth, life, and rebirth of stars is an ongoing process in the universe. The byproducts of this process include planets and the elements that make life possible. GALAXIES Galaxies come in diverse shapes and sizes. NGC 4414 — which is located about 62 million light-years away — is an example of a spiral galaxy. As with most spirals, the central ...

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Types of Binoculars

Binoculars are used for viewing distant subjects. It has two identical and aligned glasses in the same direction. It comes in different types and styles, serving different purposes.

"Binocular" comes from the Latin word "bini" which means "double," and "oculus" meaning "eye." The advantage of using two eyes with the use of this gadget is that it gives a wider view.

These gadgets are more commonly used by astronomers, hungers, navigators, sports fans watching a game, travelers, and militaries.

Different types of binoculars:
o Galilean binoculars - this binocular has the advantage of giving erect images. However, its capability of viewing wider images is limited. It cannot be used for high magnification. It also has two eyepieces, a convex objective and a concave eyepiece lens.

o Porro prism binoculars - the inventor Ignazio Porro, an Italian optician, designed this binocular. He used objective lenses separated off-set from the eyepiece. This maintains a folded optical path for wider and clearer views.

o Roof prism binoculars- this was designed by Achille Victor. This features an erected image. It also folds the path, making the object aligned with the eyepiece.

o Porro vs. Roof prisms - this was made for reducing the light transmission to about 12%. Porro prism binoculars also give brighter images. However, this binocular also features a similar magnification object size and optical quality.

Binoculars are useful in many fields. In astronomy, specialized lenses and gadgets are being used to enlarge and emphasize very distant objects from the sky.

Binoculars started in the 1970s and became must-have gadgets almost instantly. Some prefer buying branded ones with trusted quality and durability. What is important however is to be knowledgeable about the varieties to make sure you are buying the right model.

Check the magnitude of the glass surfaces. Some coatings are designed to reduce the glare of a bright light, as seen through the eyepiece. The common magnification is 7x50 or 8x25. The first digit refers to the number of zoom you can do and the second is the distance or the diameter from the front object you are attempting to view.

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Samsung 50-Inch 1080p DLP HDTV Review

Are you thinking of buying a Samsung 50-inch 1080p DLP HDTV?

This is a popular DLP HDTV model, and is a bestseller in many different shops. It has been around for just over half-a-year, and the customer base and comments has grown enough that we can now get a good feel for its pros and cons. I've consolidated a number of customer reviews from around the net. Overall opinion is that HDTV model is good and cheap, but not perfect.

Here is a useful rule of thumb: If you want to buy a HDTV, find out the watching distance in feet and multiply that with 5. That's the size of the screen you need. For example, if your watching distance is 10 feet, 10 times 5 is 50. So choose a 50-inch TV.

Good Points

Even when Samsung 50-inch 1080p DLP HDTV first came into the market, it was one of the cheaper 50-inch HDTVs. Now that the model is half-a-year old, it is even cheaper if you buy it from online retailers like Amazon. You are likely to see about $500 of savings off the list price. You also save on certain taxes and shipping costs. Additionally, if you find that the price has dropped between the time you bought the TV and the time you received it, you can ask the retailer to refund the difference. Reputable companies like Amazon actually honor such requests.

Although electronics tend to become obsolete quickly, this HDTV was leading edge when it came out. It already had 1080p resolution - many broadcasters are still catching up to this latest standard. Even now, its technology is quite advanced, and will likely remain so for the next few years.

Samsung 50-inch 1080p DLP HDTV uses an advanced technology called LED light engine. What it means for you is that the pictures are clear and detailed, and the colors look natural and true. Movement and action is much better rendered compared to normal LCD technology, and you won't see blurring or loss of detail. This HDTV also does well in bright rooms with considerable daylight penetration.

The built-in 2-speaker surround sound is of good quality. Do make sure the surround sound mode is turned on. HD broadcasts received over a simple, cheap, indoor antenna look great. Other content (Regular DVDs, SD/HD broadcasts, Nintendo Wii, DVD, Xbox 360, etc.) also look fantastic.

You probably already know its dimensions: 45.2"(W) x 31.8"(H) x 13.4"(D) 61.3 Lbs. This 50-inch DLP HDTV is thinner than many of its competitors, and is light enough for 2 persons to move around.

There are abundant connection inputs for HDMI, S-video, RGB component, digital, optical and analog sound, and RCA jacks, and they are located on the right side of the set for convenient access - this makes it easy to hook up. Unfortunately, this can be an issue if you place your TV in a cabinet.

Samsung 50-inch DLP HDTV is pretty user-friendly. The user manual is good and extensive (although not written for novices). The remote is intuitive and the menu system is straightforward. Note that it may not have as many functions as more expensive systems.

Its pretty quiet, since it uses LED light sources instead of the more normal bulb and color wheel of most other DLPs. Since the LED engine is cooler and more energy-efficient than the bulb and color wheel, Samsung 50-inch DLP HDTV also doesn't need a powerful cooling fan. Overall, you get good energy savings - it is Energy Star rated. Another good point is that the LED lasts longer than the bulb of normal DLPs (which need to be changed every 2 or 3 years).

Some of you might be nervous about getting faulty goods by buying from online retailers. The big and reputable companies like Amazon usually have a 30-day guarantee period. When any problems crop up, they have a good reputation of honoring their commitments to replace or refund the TV. If you are not certain about your online retailer, you can check their reputation with the Better Business Bureau.

Problems Encountered By Customers

Buying this DLP HDTV is not perfect, though. Customers have reported 3 main kinds of problems.

1) Delivery & Service Problems:

a) Some customers complain about not receiving their TVs. This is more likely to happen with online retailers with their more complex supply chain and delivery procedures - either their orders were not received by the vendor supplying the TV to the online retailer, or the delivery agent did not receive the correct delivery from the vendor, etc. There are precautions you can take to minimize problems (see the section below).

b) Sometimes you get an incompetent or lazy deliveryman. He may not be able to find the place you live. Or he may not want to deliver to your doorstep. Or he may just drop your TV off at your doorstep and refuse to carry it in for you. On the other hand, there are also stories of deliverymen who go beyond the call of duty - they help you to move your old TV to its new location, then they bring your new Samsung 50-inch 1080p DLP HDTV in and install it for you. Then the even take away the packing crate for you. Sometimes they do it for free, sometimes you have to pay them a few bucks extra.

c) There are also some complaints of poor customer service from Samsung. It is typical of any large company's service - when you get a good Customer Representative, you get good service. It helps if you get their name ahead of time before you start telling them about your problems or asking them questions. If you get a jerk, you get lousy service. Don't get mad, get their name, and escalate to their boss. If that doesn't work, get a refund or replacement from your retailer.

2) Quality Control Problems affecting some individual TVs:

a) The dreaded "blue-halo" effect, which basically is a blue-ish area of light that becomes visible in dark areas of high-contrast scenes, around the lower center of the screen. This seems to be caused by a ring around the lens of the projector that should be black, but is reflective silver in some TVs.

b) There is a "hot" or bright spot in the middle of the screen and the center is a little brighter than the edges.

c) When the entire screen is one color, sometimes the four corners of the TV fade in brightness.

d) The image is skewed (left side lower than the right), there is a noticeable green tint that is not correctable via any of the user settings.

e) Picture shuts off for minutes or hours at a time - which can be a motherboard problem.

f) Spots on the screen - which can be an unfixable LED light engine problem.

If the problem crops up well within the online retailer's guarantee period (typically 1 month), then call Samsung customer service and they will send a technician in about 2 working days to fix the problem. Otherwise, make good use of your retailer's guarantee period to get a replacement. Reputable online retailers like Amazon are pretty good about honoring their guarantees without hassling their customers.

3) Problems with the model or DLP HDTV technology which affect all TVs:

a) SD images via digital cable (connected via HDMI) are sometimes a little pixellated.

b) Small amount of curvature on horizontal lines right at the top of the set (which is a common artifact with this type of set) - not generally noticeable.

c) Minor incompatibility with 480p resolution settings and DirecTV (call your DirecTV customer service to get some satellite technicians to figure this out)

d) Echo if you have both TV speakers & surround sound speakers on and the volume is high. Just mute the TV, or use 5.1 or 7.1 surround sound.

e) When viewing non-HD programming in 4:3 mode there are a set of double lines at the edge of the image. This may be too distracting for some people.

f) When playing a letterbox or widescreen DVD the 16:9 or Zoom settings are a little off. The center of the image at the top is nearly 3/4 inches lower than at the ends creating a slight "U" shape or concave appearance. This can also be very distracting for some people.

g) Slight geometry problems (noticeable bowing towards the top center portion of the screen)

h) On non-stretch mode with SD (where you have a black bar down each side of the picture), the sides of the image are bowed in a little bit.

i) Viewing angle is limited, which sucks if you have a large number of people gathered around it. Just make sure that you're in the center and can see the screen. The viewing angle is good to about 140 degrees, although it is best up to 90 degrees. Still, this is supposed to be the normal level of performance for DLPs. Basically, the best seat is the sofa in front of the TV, although anyone on the love seat has just as good a picture.

Precautions To Take

1) If you buy from an online retailer like Amazon, make sure the TV is sold directly by Amazon. Amazon sometimes acts like a storefront for other companies. This means that you are the other company's customer, not Amazon's. How can you tell? Look for this sentence on the 1st page after Amazon lists the "Price" of the TV - "Availability: In Stock. Ships from and sold by Amazon.com." Other online retailers should have something similar.

2) Print the receipt. Although this is common sense, sometimes we forget. Or something else happens, for example, your printer breaks down. If this happens, just take a screen capture and save the picture to Microsoft Word.

3) Remember: You are probably buying online to take advantage of lower costs and free shipping. Don't expect 5-star service. Take the initiative to find out the contact of the actual supplier and delivery agent so that you can keep track of your order and delivery. Call the online retailer's customer support if you have any doubts.

4) If you think there is a problem with your Samsung 50-inch 1080p DLP HDTV, take advantage of the 30-day guarantee period to get a replacement or refund. Don't suffer problems for 3 months before complaining. By this time, it is too late.

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3 Types of Telescopes - Know the Differences Or Risk Buying the Wrong One

There are 3 main types of telescopes and each one performs differently and may be used for different purposes. If you are thinking about buying a telescope to look at stars and deep space then you should know that this might not be possible if you live in a built up area with light pollution. If it is just the moon and the planets you want to look at then you should now that refractors are better than reflectors for this. If you are prepared to travel with your telescope then you should know which types are fragile and which ones give you the best performance from a smaller scope.

The three types of telescopes that exist for capturing light so that it may be magnified for viewing are Catadioptric, Newtonian Reflector and Refractor.

Refractor Telescope

The traditional long-tube looking telescope. The Refractor uses lenses to bend light and this causes the rays to meet at a point on the other end of the telescope. They are magnified by the eyepiece for viewing. There is a large lens on the front of the Refractor, which is the objective lens.

Pros

Requires little to no maintenance
Excellent for planetary viewing

Cons

Color deviation in achromatic designs
Not recommended for deep sky observation

Reflector Telescope

The Newtonian Reflector uses a primary mirror that is concave. This mirror sends light to a flat mirror which reflects the light out a side opening and to the eyepiece where it is magnified and focused.

Pros

Best for deep space observation - Great for looking at remote galaxies
Delivers very bright images

Cons

Requires regular alignment
Requires more complicated cleaning of mirrors than other types of the same design

Catadioptric Telescope

The last of the three types of telescopes and currently the most popular on the market. This type uses a series of lenses and mirrors that fold the light path and send it through to the primary mirror through a small hole. This allows the light to be magnified and focused for viewing. There are two types of Catadioptric telescopes - Schmidt-Cassegrain and Maksutov-Cassegrain. The Maksutov type has a concave and convex correcting lens where the light enters. The light hits the primary mirror, is sent back to the secondary mirror and finally sent to the opening in the back of the telescope.Pros

Portable and easy to use
Versatile - good for deep space and planetary observation
About the best for focusing
Excellent optics

Cons

It does not look like a telescope to many people
It is more costly than other Newtonians with the same size opening for light

Once you know what you want to look at and which of the types of telescope you should choose you need to think hard about how much you are prepared to carry around, telescopes can be bulky and your tripod and mount are essential bits of additional kit. Size determined, you are now ready to see just how much aperture you can get for your money. Don't concern yourself with magnification, it is not nearly as important as is touted and higher magnifications will cause images to be blurry because of air turbulence. The performance of a telescope depends on how much light gathering capability it has, the more light it can gather the better you will see, and this is aperture. As a general rule of thumb, once you know which of the types of telescopes is best for you, get the biggest aperture you can afford for your money.

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Melting steel with solar power

Cut your energy bills by half! Complete guide to building your own solar panels. bit.ly Clip from James May's Big Ideas where bunch of hippies burn and melt stuff with their 'solar furnace', oh and it has something to do with making petrol out of thin air.

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3 Rules of Geometrical Construction for Convex & Concave Lens

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