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Glaucoma is an eye disease in which the optic nerve is damaged in a characteristic pattern.
This can permanently damage vision in the affected eye(s) and lead to blindness if
left untreated. It is normally associated with increased fluid pressure in the eye
(aqueous humour).1 The term "ocular hypertension" is used for people with
consistently raised intraocular pressure (IOP) without any associated optic nerve damage.
However, if the ocular hypertension is associated with optic nerve damage, the condition is
labeled as glaucoma. The nerve damage involves loss of retinal ganglion cells in a
characteristic pattern. Raised intraocular pressure (above 21 mmHg or 2.8 kPa) is the most
important and only modifiable risk factor for glaucoma. However, some people may have
high eye pressure for years and never develop damage, while others can develop
nerve damage at a relatively low eye pressure. Untreated glaucoma can lead to
permanent damage of the optic nerve and resultant visual field loss, which over time
can progress to blindness. Glaucoma can be roughly divided into two main categories,
"open-angle" and "closed-angle"(or "angle closure") glaucoma. The angle refers to
the area between the iris and cornea, through which fluid must flow to escape via
the trabecular meshwork. Closed-angle glaucoma can appear suddenly and is often
painful; visual loss can progress quickly, but the discomfort often leads patients to seek
medical attention before permanent damage occurs. Open-angle, chronic glaucoma tends
to progress at a slower rate and patients may not notice they have lost vision until the
disease has progressed significantly. Glaucoma has been called the "silent thief of sight"
because the loss of vision often occurs gradually over a long period of time, and
symptoms only occur when the disease is quite advanced. Once lost, vision cannot
normally be recovered, so treatment is aimed at preventing further loss.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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