Provide structures of the intermediates and the final product. 
Definitions:
Pupil
The circular opening in the center of the eye that allows light to enter and reach the retina, adjusting in size to regulate the amount of light.
Cornea
The clear, protective outer layer of the eye that helps to focus incoming light.
Fovea
A small depression in the retina of the eye where visual acuity is highest, due to a high concentration of cones.
Purity
The state or quality of being free from contaminants, immorality, or imperfections; often associated with morals, substances, or intentions.
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