Research Papers. 1  Establish your topic. 2  Look for sources of information. 3  Read your sources and take notes. 4  Organize your ideas. 5  Write a first draft. 6  Use footnotes or endnotes to document sources. 7  Write a bibliography. 8  Revise the first draft. 9  Proofread the final draft.
The Retina. The retina is a light-sensitive layer at the back of the eye that covers about 65 percent of its interior surface. Photosensitive cells called rods and cones in the retina convert incident light energy into signals that are carried to the brain by the optic nerve.
The retina has about 6 million cones and 120 million rods. Cones are cone shaped structures and are required for bright light (day light) vision. Rods are rod like structures and are required for dim light (twilight/ night) vision.sually located in the centre of retina. All rod cells are alike, and do not give colour vision. Cones are of three types: blue, green and red, and give colour vision. Sensitive to dim light and give twilight vision.