1 The highest monthly average temperature in Keystone for July is 54 degrees. 2  The lowest monthly average temperature in Keystone for December is 14 degrees. 3  The most monthly precipitation in Keystone occurs in January with 0 inches.  The air quality index in Keystone is 15% better than the national average.
Simple eye in invertebrates. A simple eye (sometimes called a pigment pit) refers to a type of eye form or optical arrangement that contains a single lens. A simple eye is so called in distinction from a multi-lensed compound eye, and is not necessarily at all simple in the usual sense of the word. The eyes of humans and large animals, and camera lenses are classed as simple because in both cases a single lens collects and focuses light onto the retina or film.
Focusing on the front sight and the weaponâs muzzle instead of the target can also change your sight. One of the simplest ways to determine eye dominance is to point at an object with both eyes open. Close one eye and if your finger is centered on the object then the open eye is dominant. Close the dominant eye and then your finger should appear off to the side. You can also make a circle with your thumb and forefinger and with both eyes open center the circle over a distance object. The eye that sees the image inside the circle when the other eye is closed is the dominant eye.