Articulo cientifico en ingles

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ARTICULO Nº 8:
CONTACT LENS: A contact lens is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Leonardo da Vinci is credited with describing and sketching the first ideas for contact lenses in 1508, but it was more than 300 years later before contact lenses were actually fabricated and worn on the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím, who also invented the first gel used for their production.
Contact lenses usually serve the same corrective purpose as glasses, but are lightweight and virtually invisible—many commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage
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* Sir John Herschel → 1845 edition of the Encyclopedia Metropolitan, posed two ideas for the visual correction: * The first "a spherical capsule of glass filled with animal jelly", and "a mould of the cornea" which could be impressed on "some sort of transparent medium".

* Dr. Dallos →1929 perfected a method of making molds from living eyes. This enabled the manufacture of lenses that, for the first time, conformed to the actual shape of the eye.

* 1887 → F.E. Muller, produced the first eye covering to be seen through and tolerated.

* 1887, → the German ophthalmologist Adolf Gaston Eugen Fick constructed and fitted the first successful contact lens. While working in Zürich, he described fabricating afocal scleral contact shells, which rested on the less sensitive rim of tissue around the cornea, and experimentally fitting them: initially on rabbits, then on himself, and lastly on a small group of volunteers. Fick filled the empty space between cornea/callosity and glass with a dextrose solution. He published his work, "Contactbrille", in the journal Archiv für Augenheilkunde in March 1888.

* 1887 → Louis J. Girard invented a similar scleral form of contact lens. Glass-blown scleral lenses remained the only form of contact lens.

* 1930→ When polymethyl methacrylate (PMMA or Perspex/Plexiglas) was

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