eyeglass prescription contains information showing the lens power required to correct vision problems. It consists of sphere power, cylinder power, cylinder axis, bifocal addition, and prism power. Your prescription may or may not contain all of these numbers, for example if you do not have a bifocal you would not have a bifocal addition in your prescription. Most prescriptions do not contain prism power. A PD (pupillary distance) measurement is also needed to produce your glasses.

eyeglass prescription is written in a standardized format with standardized notation so it can be interpreted worldwide. Let's look at one and break it down: x 180. The first number (-2.00) tells us the spherical refractive error (farsightedness or nearsightedness). In this case, because there is a minus sign in front of the 2.00, this patient is nearsighted. A plus sign would indicate farsightedness. The second number (-1.00) is the astigmatism.

Varilux lenses are available in a variety of different materials that will reduce both thickness and weight. Smaller frames also reduce lens thickness and weight. We at American Vision Care will consider prescription, frame size, and your individual lifestyle as factors in helping you decide which lens material will be best for you.

The numbers in parenthesise indicate how many new topics (or posts) have been made since your last visit to the forums. Registered (anya, Camille, hudson702, Manuella, mindfreak, pharos, 1 invisible), 121 Guests and 51 Spiders online.

That 10-10-10 on the bag or bottle is best explained by remembering "up, down, all-around". The first number is the percentage of nitrogen by weight. Nitrogen promotes growth and green-up. The second number is the percentage of phosphorus by weight and is helpful for good root growth. The third number is the percentage of potassium by weight which promotes all-around plant health such as hardiness and disease resistance. Gordon's currently has 3 liquid fertilizers and a granular weed and feed.

MapServer's version numbering scheme is very similar to Linux's. For example, a MapServer version number of 4.2.5 can be decoded as such: Minor version number. Increments in minor version number almost always relate to additions in functionality. From a developer's standpoint, MapServer version numbering scheme is also like Linux. Even minor version numbers (0..2..4..6) relate to release versions, and odd minor versions (1..3..5..7) correspond to developmental versions.

Yes, there are two ways of writing a prescription for astigmatism. Some prescriptions are written in (-) cylinder and some are written in (+) cylinder. These prescriptions are equal even though they may not appear so.

No, you cannot use your eyeglass prescription to order your contact lenses. Contact lens prescription and eyeglass prescription are different. It should be noted that the power of a contact lens would not necessarily be the same as that of a spectacle prescription due to the optics of a lens being closer to the eye.

After the completion of a patient's comprehensive eye examination, and upon the patient's request, a copy of the patient's prescription for eyeglasses shall be given, free of charge, to the patient or to another optometrist, ophthalmologist, or ophthalmic dispenser acting on the patient's behalf.

Understanding your eyeglass prescription is actually easier than you think, provided that you understand the nomenclature. After reading this, you'll be a prescription pro, and you'll be able to impress all your friends at your next neighborhood eyeglass prescription pool party. First, let's look at a sample eyeglass prescription that might look something like this: To begin with, OD and OS are Latin abbreviations for the right and left eyes, respectively (OD=right, OS=left).

Spectacle lenses are made of two main types of materials - plastic or glass. Plastic lenses are often CR39 or polycarbonate. Both main materials come in a variety of refractive indexes, designed to minimise the thickness. HiIndex lens materials are commonly 1.56, 1.60 and 1.67, as compared to 1.523 for common crown glass. The refractive index of plastic lenses is capped at around 1.74, whereas glass lenses range up to an index of 1.9, making them potentially thinner.

They are chemical additives (such as preservatives) that are approved by the European Union (EU) for use in food. We can send you a full list of E-numbers or you can see them on our website.

Remember that there was no common year 0. The year preceding the common year 1 is the year -1 on my dropdown list. So this would correspond exactly to what is meant by 1 BCE (before the common era). Similarly -100 would be 100 BCE, etc.

Talk to your health care provider about the results of your cholesterol test. The following guidelines come from the National Cholesterol Education Program (NCEP) of the National Heart, Lung, and Blood Institute, National Institutes of Health. Cholesterol levels are measured in milligrams (mg) of cholesterol per deciliter (dL) of blood. Total cholesterol level - a level of less than 200 mg/dL is desirable.

Numbers will be automatically added to the end of an auto-received file if there is a name conflict in the auto-receive directory. The numbers indicate the time that the file was received. For example, say that you have a file called "MyFile.txt" in your auto-receive directory, and someone sends you a file named "MyFile.txt." The second "MyFile.txt" will have the time placed at the end, such as "MyFile.txt103215" indicating that the file was started at about 10:30 am.

The federal government requires all air conditioning and heating equipment to be rated for efficiency. The higher the rating, the more efficient the model. Gas furnaces are rated for (Annual Fuel Utilization Efficiency). This defines the amount of heat used to warm your home from the burned fuel. A 90% furnace will use 90% of the available heat to heat your home. 10% of the heat is vented outdoors. Many older gas furnaces are only 60% efficient. The other 40% is vented outdoors.

GDC stands for the Institute of Genetic Disease Control. GDC formerly maintained canine health databases similar to those of the OFA. In the Fall of 2002, the GDC databases were merged with the OFA. Numbers beginning with GDC indicate that the evaluation was performed by GDC prior to the merge.