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2. Achromatic telescope - Wikipedia

   en.wikipedia.org/wiki/Achromatic_telescope

   An Achromatic telescope uses an achromatic lens to correct for this. An achromatic lens is a compound lenses made with two types of glass with different dispersion. One element, a concave lens made out of Flint glass, has relatively high dispersion, while the other, a convex element made of Crown glass, has a lower dispersion. The crown lens is ...

3. Contact (1997 American film) - Wikipedia

   en.wikipedia.org/wiki/Contact_(1997_American_film)

   Contact was released on LaserDisc, VHS and the (then new) DVD format in December 1997. Among the special features are three audio commentaries: by director Zemeckis and producer Starkey, by visual effects supervisors Ken Ralston and Stephen Rosenbaum, and by star Jodie Foster. [34] Contact was released on Blu-ray Disc on October 6, 2009 ...

4. Fungal contamination of contact lenses - Wikipedia

   en.wikipedia.org/wiki/Fungal_contamination_of...

   Factors which contribute to fungal contamination of contact lenses include, but not limited to, "hygiene negligence such as": Improper sterilization and disinfection of contact lenses; Use of contaminated lenses; Contaminated contact lens case; Contaminated contact lens solution; Wearing of "contact lenses during eye infections"

5. Orthokeratology - Wikipedia

   en.wikipedia.org/wiki/Orthokeratology

   Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

6. What to Know About Colored Contacts—and Why You Shouldn’t Buy ...

   www.aol.com/lifestyle/know-colored-contacts-why...

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7. Chromatic aberration - Wikipedia

   en.wikipedia.org/wiki/Chromatic_aberration

   In optics, chromatic aberration (CA), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [ 1 ] [ 2 ] It is caused by dispersion : the refractive index of the lens elements varies with the wavelength of light .