If you're considering a glazed entry door, you'll have many glass
options to choose from, including clear, etched, beveled, leaded and many
other ornamental glazings. Windows may be standard single glazed, dual glazed
or even triple glazed.
For maximum light, consider a door with a large glass area. For privacy
and security, opt for one or two small sections of glass, or glazing that
is decorative and obscures the view into your house. If there is a possibility
of ultraviolet (UV) damage to floors, rugs and furniture, consider choosing
a glazing that resists UV rays.
--Don Vandervort