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Spherical Aberration: A type of optical aberration that occurs when light rays passing through the edges of a spherical lens focus at different points than rays passing through the center, resulting in a blurred image.

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Lens Maker's Formula: An equation used to determine the focal length of a lens based on its shape, the curvature of its surfaces, and the refractive index of the lens material.

Aspheric lenses are optical lenses designed with a non-spherical surface profile, allowing for improved focus and reduced optical aberrations. These lenses are specifically shaped to eliminate or minimize common issues like spherical aberration, which can distort images and lead to blurriness. By using aspheric surfaces, these lenses can achieve better image quality and thinner profiles compared to traditional spherical lenses.

Optical Aberration: A general term that refers to any distortion in the image produced by a lens, including spherical aberration, chromatic aberration, and others.