Single Vision: 

Nikon lenses offer 2 types of lenses for single vision: spherical and aspheric/multi-aspheric lenses. Aspherical lenses are flatter and thinner then spherical lenses and have two distinct advantages:

• Better vision. They have less distortion around the edges of the lenses, which allows for sharper vision.
• A more attractive look. They have less magnification, so they have less impact on your appearance

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