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However, if you ever plan on trying to order a pair of eyeglasses online without visiting the optician’s office it’s imperative that you know how to properly read your prescription it you want to get a pair of glasses that you can see out of.

You prescription will often be delivered as a pair of numbers – one number under the Latin abbreviation of OS (your left eye) and the other under the Latin abbreviation OD (your right eye). The farther away either number is from zero in either direction (plus or minus) the worse your eyesight is and the more correcting your vision will need for you to be able to see clearly.

If the numbers in your prescription are in the positive it means that you are farsighted, or that you have problems with seeing things close to you; if the numbers are in the negative it means that you are nearsighted or that you have difficulty viewing objects that are far away.

If you suffer from astigmatism you’ll see three numbers in your eye glasses prescription – the first of which will represent both of the numbers seen in a prescription of a person who doesn’t have astigmatism, the second number will represent the severity if the astigmatism – the larger the number here the greater you are effected by the astigmatism. The third number in the prescription of a person who suffers from astigmatism will be between zero and one hundred and eighty and this number reveals the location of the astigmatism. For proper corrective treatment of astigmatism, the technician making your lenses needs to know the location of the astigmatism in degrees as well as the level of severity.

Each of the numbers that you see in your eyeglass prescription is crucial to the final result, the numbers may be whole numbers or they may be fractional (like 1.25, representing one and one quarter) and the exact number is required for you to be able to see clearly. The numbers represent "diopters" which is the unit of vision correction from which your lenses will be manufactured. If you are off by even a fraction of a point when relating the information of your diopters, your glasses may not be as precise as they need to be to properly correct your vision. When relating all of the numbers and symbols of your eyeglass prescription for an order it’s imperative that you be precise or you will receive a pair of glasses that won’t properly correct your problem.

There are other considerations when contemplating ordering prescription glasses online that don’t necessarily have to do with your prescription itself, but that could seriously affect the corrective properties of your glasses. The most common number not represented in your prescription that you’ll need to know when ordering glasses online is the distance between your pupils, or your PD. There’s a good chance that your PD will be imprinted somewhere on your old glasses, if you’ve still got them – if you don’t the number isn’t all that difficult to get. You’ll need a ruler that measures in millimeters and a mirror. All you do to get you PD is to look straight ahead into the mirror and hold your ruler directly below your eyes to measure the distance between the centers of your pupils. The most common distance for a PD is between 58 and 70 mm, so if your distance is either well under 58 or well over 70, you might want to measure again.

Reading your prescription and ordering glasses without visiting the optician is certainly possible, but if you have any questions about what you’re reading it’s highly advisable to visit your eye care professional to be certain that you get it right – eyeglasses are expensive and you certainly won’t be able to return a custom pair, so make sure you get everything right before you make anything final.

Author: Amy Nutt

How to read eyeglass prescriptions

With such a valid and updated prescription, eyewear customers can resort to any other resources for prescription eyeglasses. They are no longer limited to buy corrective spectacles from eye care practitioners.

How do I read my prescription?

How to read glasses prescription ? Knowledges about Bifocal Glasses October 6th, 2009. On a typical prescription, you will see two sets of rows.

How to read your glasses prescription?

With the growing popularity of prescription glasses, the demand for trendy, beneficial and cheap online glasses is on an upward slope. But fef it all starts here: how to read your prescription?

Understanding Your Glasses Prescription

If you have already read part one of our guide to understanding your glasses prescription then you’ll love this second installment, helping you to decifer.

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Thinking about the sheer number of people you know that require some type of vision correction and how their lives would be affected for the worse if eyeglasses had never been invented puts some perspective into just how important the invention of eyeglasses was to humanity.

We know a good time frame for when eyeglasses where invented, as there are several references to lenses that magnified and aided vision in writings dated between 1265 and 1290, but the actual person responsible for inventing eyeglasses remains a mystery.

Original Glasses

From descriptions and imagery in paintings it is known that the original eyeglasses were quite a bit different than the glasses of today. Original eyeglasses were only perched on the nose, with no extra means of support – this made them very uncomfortable for the wearer and very unsteady if the person wearing them had to do any moving about at all. It wasn’t until the more than four hundred years later (sometime during the 1720’s) that the frames evolved into what we would recognize as eyeglasses today with arms that use the wearer’s ears as the primary means of support, making glasses much more comfortable and stable to wear.

The first pairs of eyeglasses produced had frames made of metal or bone and, at the time the "opticians" didn’t have the capabilities of producing flawless lenses in glass so original eyeglasses had lenses made out of quartz.

Over the next few hundred years glasses evolved in both function and comfort, glass became a viable option for lenses because production methods that eliminated bubbles and other imperfections emerged. Glasses were produced to correct a variety of vision problems, from simple magnification for reading to correcting near sightedness and far sightedness.

Evolution of Eyeglasses

In the mid 1780’s, American pioneer, inventor and visionary Benjamin Franklin invented the first version of the bi-focal. It was said that Franklin was bothered by the hassle of having to constantly change glasses to be able to clearly see as he completed different tasks, so to put an end to the hassle he began work on a set of lenses that would work to correct both vision problems that he suffered from.

In recent years lenses have evolved even further beyond what even the great mind of Benjamin Franklin could have imagined – progressive lenses these days have any number of different correction properties as you proceed from the top of the lens down to the bottom.

The frames of eyeglasses have also come a long way since the invention of eyeglasses. Today your average wearer has little trouble getting their hands on an almost weightless frame that is practically indestructible. New advancements have made possible the creation of eyeglass frames that can be bent and twisted and then will just return to their originally designed shape.

It’s also safe to assume that without the invention of eyeglasses that there would be no hard or soft contact lenses and that there would be no vision correction surgery available. Though it’s impossible from the information that we have to determine exactly who invented eyeglasses, it’s very safe to say that whoever had a hand in the creation and development of this form of vision correction changed the way that a huge part of the history of the population went about living their lives for the better. If it weren’t for eyeglasses as we know them, there are a lot of people over the course of the last several hundred years whose quality of life would have been substantially lower than it was because of the benefits received from eyeglasses.

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Read on, to find out how to pick out the best frames and lenses.

First of all, you need to choose the style you like.The classic fully-rimmed frame suits all and can be found in a variety of colors.Semi-rim glasses are also known as half-rimless and typically cover the top-half of the lenses.This type of frame offers a modern, stylish look. More popular frames these days are the rimless frames; where there is no frame encircling the lenses, and the metal bridge and temples are mounted directly onto the lenses. If you are long-sighted, it’s not recommended to buy this kind of frame.The lens is very thin around the edge, so is likely to crack around the drilled holes.

Frames can be found in both plastic and metal.Titanium metal is commonly used for its durability and resistance to corrosion.While stainless steel is lightweight and suits people with sensitive skin.If you like colourful styles, plastic frames will be more to your taste.Layers of colors can be used to create a multi-color effect.

Once you’ve decided on the type of frame you like, you have to choose the type of lens you want.Lenses are made from plastic or glass.Modern day lenses are made from polycarbonate, which are lighter and thinner than traditional plastic lenses.You can also choose from different indexes to make the lenses thinner.Indexes typically range from 1.53 to 1.74, where the lens with the higher index is lighter and thinner.

The lenses can then be tinted for fashion purposes, or to act as sunglasses. Transition lenses automatically change their level of tint according to the light conditions, so that you don’t have to worry about having a pair of glasses and a pair of sunglasses.Another type of lens is the polarized lens which reduces glare from reflective surfaces.This type of lens is great for those who enjoy water sports.

Apart from the fundamentals of frames, you will need to choose a frame according to your face shape and skin tone.You should choose a shape opposite to your face shape.For example, if you have a round face, you should pick a square or rectangular frame.If you have a rectangular face, round or oval frames, will compliment your face shape.

If you have green, blue or grey eyes and blonde, black or brown hair, frames in pink, blue, silver or black will suit you.However, if your eyes are black, brown or hazel and you have blonde, brown, blonde, red or black hair, then frames in white, gold, green, orange and brown will look good on you.

Take your time in choosing the correct pair of frames.Like clothes, there are plenty of styles and colors to experiment with.

Author: Li-Sa Lim

Find Out How To Choose The Eye Glasses Frame That Is Perfect

The best shape of the eye glasses frame that you choose should be one that is a balance for the way your face is shaped. However, when it comes to the size of the frame you will want to find one that is the best match to the size.

Discover How To Choose The Perfect Eye Glasses Frame For Your Face

The perfect eye glasses frame for your face may or may not be the one that is in high fashion. If the most popular frame is not the best one for your face do you still want it?

Choosing the perfect frames for your eyeglasses

If you wear specs every day they have to be the best pair for your eyes and face that you can afford. End of story. Specs are the first thing that people see.

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