Description

Learn how the eye works and how you can correct your vision with contacts. Learn if wearing contact lenses can harm you. Topics covered are how contacts are made, contact lens material and types, how contact lenses work, how to wear contact lenses, how to care for contact lenses, choosing contact lenses, disposable contact lenses, RGP contact lenses, Toric contact lenses, treated contact lenses, changing your eye color with contact lenses, and contact lenses versus laser surgery.

Description

Chapters: Contact Lens, Advanced Medical Optics, Renu, Alcon, Acuvue, Bionic Contact Lens, Fairness to Contact Lens Consumers Act, Circle Contact Lens, Scleral Lens, Ultravision, O2 Optix, Base Curve Radius, Coopervision, Ciba Vision, List of Acuvue Products, Rigid Gas Permeable, Oxygen Permeability. Source: Wikipedia. Pages: 68. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: A contact lens (also known simply as a contact) 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 invisiblemany commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions. Some cosmetic lenses are deliberately colored to alter the appearance of the eye. Some lenses now have a thin surface treatment which is a UV coating; this helps to reduce UV damage to the eye's natural lens. It has been estimated that 125 million people use contact lenses worldwide (2%), including 28 to 38 million in the United States and 13 million in Japan. The types of lenses used and prescribed vary markedly between countries, with rigid lenses accounting for over 20% of currently-prescribed lenses in Japan, the Netherlands and Germany but less than 5% in Scandinavia. People choose to wear contact lenses for many reasons, often due to their appearance and practicality. When compa...More: http://booksllc.net/?id=74845

Description

Traditional color-by-number is a bore once you see the light shine through these 20 different projects. Use the included double-nibbed markers to create your art directly on the see-through vellum pages using our suggested color pairings, or create your own. Make a window hanging, a Japanese banner or a mobile – a shining example of Klutz at it’s finest.

Features

• Recommended for ages 8 and up

Description

Seeing Color: It's My Rainbow, Too is the first book for children on the subject of color vision deficiency (CVD), commonly called "colorblindness," which affects 1:12 males and 1:200 females worldwide. Designed for the 9-12 year old, the book contains valuable information for older children and can be read to and discussed with younger children.