We rely on bottles from the waste stream and are subject to their availability and quality. Sometimes we experience difficulty procuring certain bottles of sufficient quality in adequate quantity to continue a line of glassware. As a result, with great sadness, we must discontinue that particular offering.

Outright genocide is one cause of language extinction. For example, when European invaders exterminated the Tasmanians in the early 19th century, an unknown number of languages died as well. Far more often, however, languages become extinct when a community finds itself under pressure to integrate with a larger or more powerful group.

A summary of extinctions by country can be found at the World Conservation Monitoring Centre, or you can search the IUCN Red List database.

We strongly suggest that you bring at least an extra months supply of whatever medications you take, along with an extra pair of glasses/contacts or a prescription for your glasses/contacts. You also should bring a letter and a prescription from your doctor. Also, remember, Florence is high in pollen content. So bring over the counter allergy medicine, even if you do not normally have any allergies. Students in the past who generally do not have this type of problem, encountered it in Florence.

restore your focus to normal, minimizing your dependence on glasses. Most people need some form of glasses, if only to read.

The fact that dinosaurs became extinct might suggest they had some "Achilles heel" which led to their downfall. But it seems it was just bad luck and they weren't alone. At the end of the Cretaceous Period all the dinosaur families, together with the pterosaurs and marine reptiles, as well as about 75 percent of all other species on earth went extinct.

Sterilisation, also known neutering, is a well-established and reliable method of preventing unwanted pets. It is a routine surgical procedure to remove the reproductive organs of animals. Sterilisation can be performed (or carried out) on male and female cats, dogs, rabbits and guinea pigs by a licensed veterinarian. In Singapore, 15,000-20,000 cats and dogs are put down yearly. Many of these could have been great family pets but there are just not enough homes for them.

Compliance with requirements to wear safety glasses used to be a big problem in industry. However, safety glasses have become much more lightweight and stylish, to the point where workers actually want to wear their safety glasses. If you offer a selection of stylish safety glasses, that are appropriate for your work environment, you will find that compliance is no longer a big problem. No, OSHA does not approve safety glasses, or any other personal protective equipment for that matter.

Safety glasses are required to be tested to ANSI Z87.1-2003. This standard includes optical requirements as well as physical requirement. Here is a list of the tests that are required: Frame shall be capable of resisting impact from a pointed projectile weighing 500g (17.6 oz.) dropped from a height of 127 cm (50 in.). Spectacles shall be capable of resisting impact from a 6.35 mm (1/4 in) diameter steel ball traveling at a velocity of 45.7 mps (150 fps).

A prescription for spectacles will generally contain the powers for lenses of each eye, possibly also a reading addition power, information on the separation of the lenses and any special requirements for the lenses (eg, type of lens, tinting, coatings etc). Lens power is written in Dioptres, which is 1/focallength(metres). For example, a 5.0D (5.0 dioptre) lens has a focal length of 0.

You can buy prescription sunglasses or glasses with photochromic lenses (which change from clear to dark) from your eyecare practitioner. Clip-ons are a less expensive option, and can be bought at the same time as your regular eyeglasses to perfectly match the frames. Magnetic attachments may also be available. Read more about prescription sunglasses and photochromic lenses.

Someone else mentioned a doll from the Lillian Vernon catalog who came with her own book (is it the same doll?). I went to our local super-toy store and in the entire aisle of dolls, not one was wearing glasses (or braces, either!).

Usually not for distance vision, although some patients may still require thinner glasses for fine tuning. When you are in the age range where bifocals or "readers" are normally required for close vision (usually 40-45 and beyond) you will most likely need reading glasses. This is a natural process known as presbyopia.

The ability to focus on near objects decreases steadily with age and is referred to as presbyopia. Presbyopia is a natural aging of the lens. It is usually near the age of 40, when glasses or bifocals are prescribed to correct this condition.

Some of the newest materials for frames include titanium (virtually indestructible) and polycarbonate materials (recommended for high impact sports). Lenses are also made from polycarbonate materials, other types of light weight plastics and glass. Coatings include UV protection (recommended for all types of lenses), scratch-resistant protection, polarization, anti-glare and others. See the Kellogg Optical Shop for more information about glasses.

Yes, usually to read small print. Currently, nearly all lenses implanted in the USA are monofocal. This means they focus at only one particular distance (focusing distance depends on lens power). If your lens gives you perfect distance vision, you will have to use glasses to read. If your lens gives you perfect reading vision, you will have to use glasses to see clearly at distance.