If you wear eyeglasses and experience tunnel vision when using your binoculars, you need extended or long eye relief. Binoculars made for eyeglass wearers should offer a minimum of 18mm of eye relief. Coated Optics-Manufacturers apply a microscopic film of magnesium fluoride either to the prism, lens, or both to enhance light transmission. This microscopic film diminishes the reflected or stray light inside a binocular allowing more light to be transmitted to the user's eye. The more applications of this coating, the greater the reduction in glare and reflections producing a brighter, crisper, image.
More coatings mean brighter, crisper images.
Now, let's get to pair of binoculars that I've found to fit my needs extremely well. This is a pair of 8x25 compact Brunton Eterna binoculars. Won't lose the caps. Brunton has created these lens covers that flip open at any angle and rotate 360 degrees. They even act as blinders to block out unwanted light from the sides.