3d TV's without glasses are becomming more and more available, however, as of right now, they have not been perfected and are not as good as the ones that you need glasses for.
In general, yes you do need special glasses to view a 3D TV. However, Sony are now working on a variant of this which does not require these glasses at all.
There are many types of 3D images, but some TVs allow you to view 3D content without glasses, but they are less common and cost a bit more.
No. You must used special ISO glasses.
A two dimensional view has no depth. A three dimensional view is seen with special glasses and has depth when viewed.
So it can protect your eyes from the light. It has enough light to damage your eyes like the sun.
Diffraction glasses differ from traditional glasses because they use a special pair of lenses that offer light grating as an entertainment source. When viewing a light source the grating effect will break the light into a prism of colors, offering the user a unique experience. You can check out companies like GloFX to view the various glasses that will feature this special lens. They also have a great FAQ page about diffraction glasses, you can read up on it by searching GloFX Glasses What Are Diffraction Glasses.
TV glasses are mostly associated with 3D capable televisions. Without these glasses, you cannot view the 3D capability as it is meant to be. The benefits of these glasses would be that they allow you to view television in a whole new way.
A 3d dvd is no different than a normal dvd except they require special players and special glasses to view the 3d format. http://entertainment.howstuffworks.com/digital-3d.htm
Special View was created in 1979.
Stereoscopic images, also known as 3D images, require 3D glasses to view properly.
No, it is not safe to view the eclipse with sunglasses. Sunglasses do not provide enough protection for your eyes when looking directly at the sun during an eclipse. It is recommended to use special eclipse glasses or other certified solar viewing devices to safely view the eclipse.
There are very few drawbacks to SG glasses. These are the 3D glasses used by Sony, Samsung, Panasonic and others for their active 3D systems. They need to be charged at intervals but other than that, they are similar to any other glasses. The active glasses are needed to be able to view 3D in full HD resolution. The passive glasses that do not need batteries are only used on systems such as LG with 540 line resolution.