For any piece of art, you want to protect it from harm and you want people to see it. Whether it is commercial framing in NYC or anywhere else, you have to balance protecting the piece and how people can most easily see and appreciate the art. There are other balancing acts too when taking care of your artwork, such as price, which could affect how you balance the other two items.
Protecting the art while it is on display is a primary concern. You need to protect the piece from dust, humidity, fingerprints, and even sunlight. Even protecting it from people who might touch the piece is also a consideration. But in doing this you also need to take into consideration how the piece will be perceived. If there is much glare at all, people will not be able to see the art as well as they might have. Commercial framing in NYC always tries to find the best balance for the piece of work in question.
The first consideration is glass and acrylic type glazing or covering. Acrylic is more expensive and can be scratched easily. It will also bend a little and is not likely to break. Glass is less expensive, and sometimes offers more clarity when on display, it is more fragile than acrylic, and since it cannot bend at all, is more prone to breaking.
The goal of your framing should be for people to see the artwork, and for the covering to be as close to invisible as possible. An anti-reflection coating can reduce reflections and glare, making your artwork easier to see. The downside is that this can cause some slight distortion at certain angles, so the viewer may not get as accurate of a view. Even so, glare can keep anyone from seeing most of the work, so reducing the glare is always a good idea.
The second part, which is just as important, is to protect your art. Ultraviolet rays and even some lighting indoors can make a piece of art fade faster than it would otherwise. Cost is the biggest drawback to this type of covering. Some lower grades of glass may have a slight green tint as well, so it is probably worth the extra expense to get high-grade glazing that will also reduce glare.
Protecting your work from Ultraviolet rays can also be done with a special coating on the glass. U-V protected glass absorbs the light, protecting it to a large degree. There is also anti-reflective and UV protected glass, which is an even higher level.
Determining where the best balance is can be found with commercial framing in NYC. Balancing cost against effectiveness is the key to having the best protected and visible art.