1. Yellow and orange filters, light to medium densities:
   • ...absorbs violet, provides clearer bull's eye outline, accepted by most shooters.
2. Dark brown or gray filters, light to medium densities:
   • ...absorbs entire spectrum, reduces glare from directly sun-lit targets, the yellow portion impedes violet.
3. Neutral gray with green shading:
   • ...impedes violet to a lesser extent than gray filters, but the green portion is pleasant to the eye for some shooters.
4. Dark yellow, orange, and yellow green filters:
   • ...brings out contrast, most suitable on sunny / overcast days, hazy but bright conditions, or early morning or late afternoon.
5. Yellow green, medium to high density:
   • ...removes excessive brightness.
6. Polarized filters:
   • ...when two polarized filters are rotated against each other, the amount of light passing through the lenses gradually changes. This allows infinite adjustment of filtering density to almost total darkness.

• age : older shooters may need more effort to focus, and stayed focused, on the target / front sight ( as the case may be );
• eye condition : near- or far-sightedness, astigmatism,...etc;
• sensitivity of eye : some people have eyes more sensitive to strong light than others ( e.g. must wear sunglasses outdoors or driving...etc);
• psychological : " I just feel better this way... "

With shooting glasses, you should start out with the best you can afford. The reason is that once you have gone through the many steps to set up your glasses properly, you really do not want to do it all over again just because now you want to upgrade to a better set. One set of glasses is good for many years. Mine is twelve years old and is still excellent ( but that of course requires that you use it properly and takes good care of maintaining it in tip top condition ).

That said, our best glasses is the Olympic Champion. With the micrometer adjustments and titanium frame, there are no equals on the market. It is easy to set up, and it lasts for a long time.

The Olympic Offset Champion is designed for archers or rifle shooters in standing positions who use an extreme aiming position, and the lens must be place right in the middle of the frame.

The cheaper version of that is the World Champion 2. This has an aluminium frame instead of titanium, and adjustment is by set screws and sliding blocks.

For those who needs to wear prescription glasses, they may want to purchase an extra lens-holder assembly for the non-aiming eye, so they can do other things at the bench such as loading the magazine, sighting the scope...etc. while they are not shooting.

People with astigmatism may want to purchase the adjustable iris diaphragm to help obtain the best possible image.

When you shoot outdoors in bright sun light you may want to have the grey or brown filters. In overcast days you may want yellow or orange filters.

If you are not wearing a shooting cap and want to block off extra side light or help your concentration, you may want the side shields.

During the initial set up process you may want the centering device to help you determine if your lens is located perfectly center with your aiming eye.

These are the most common accessories people would want to purchase. Some bought everything together to save shipping charges, some buy them one piece at a time when they feel there is the need. Whether you need all these at once must be decided by none other than yourself, because you know your own needs best.