While many internet pharmacies sell prescription drugs only with a prescription, some do not require a pre-written prescription. In some countries, this is because prescriptions are not required. Some customers order drugs from such pharmacies to avoid the inconvenience of visiting a doctor or to obtain medications which their doctors were unwilling to prescribe. Many of these websites employ their own in house physicians to review the medication request and write a prescription accordingly.

Some websites offer medications without a prescription or a doctor review. This practice has been criticized as potentially dangerous, especially by those who feel that only doctors can reliably assess contraindications, risk/benefit ratios, and the suitability of a medication for a specific individual. Pharmacies offering medication without a prescription and doctor review or supervision are sometimes fraudulent.

In the United States, there has been a push to legalize importation of medications from canadian pharmacy and several European countries, in order to reduce consumer costs. Although importation of prescription medication usually violates Food and Drug Administration (FDA) regulations and federal laws, enforcement is generally targeted at international drug suppliers, rather than consumers. Often Americans purchase lower-cost foreign drugs by driving to Canadian or Mexican pharmacies, buying their medications when traveling abroad on vacation, or, buying from foreign pharmacies that ship their orders via mail.

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The NV portion is used in prescriptions for bifocals.

In younger people, the lens of the eye is still flexible enough to accommodate over a wide range of distances. With age, the lens hardens and becomes less and less able to accommodate.

This is called “presbyopia;” the “presby-” root means “old” or “elder.” (It is the same root as in the words “priest” and “presbyterian.”)

The hardening of the lens is a continuous process, not something that suddenly happens in middle age. It is occurring all along. All that happens around middle age is that the process progresses to the point where it starts to interfere with reading. Therefore almost everybody needs glasses for reading from the age of 40-45.

Because young children have a wider range of accommodation than adults, they sometimes examine objects by holding them much closer to the eye than an adult would.

This chart (which is approximate) shows that a schoolchild has over ten diopters of accommodation, while a fifty-year-old has only two. This means that a schoolchild is able to focus on an object about 10 cm. (4″) from the eye, a task for which an adult needs a magnifying glass with a rated power of about 3.5X.

The NV correction due to presbyopia can be predicted using the parameter age only. The accuracy of such a prediction is sufficient in many practical cases, especially when the total correction is less than 3 diopters. See also the following calculator for computing this correction.

The leftmost image above shows a Snellen eye chart as it might be seen by a person who needs no correction, or by a person who is wearing High-indexed Prescription Eyeglasses On Sale or contacts that properly correct any refractive errors he or she has.

The images labelled 1D, 2D, and 3D give a very rough impression of the degree of blur that might be seen by someone who has one, two, or three diopters of refractive error. For example, a nearsighted person who needs a -2.0 diopter corrective lens will see something like the 2D image when viewing a standard eye chart at the standard 20-foot distance without glasses.

A very rough rule of thumb is that there is a loss of about one line on an eye chart for each additional 0.25 to 0.5 diopters of refractive error.

The top letter on many eye charts represents 20/200 vision. Many people cannot read even this top letter without glasses. The definition of legal blindness is not based on vision without glasses. The U. S. Social Security administration, for example, states that “we consider you to be legally blind if your vision cannot be corrected to better than 20/200 in your better eye.” In other words, what matters in evaluating legal blindness, and for many other purposes, is corrected acuity—which line of the chart can be read with proper lenses. One purpose in which uncorrected vision makes a difference is for receiving a driver’s licence that is good without lenses; a person who needs lenses may receive one that requires him to wear the said lenses.

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