Different lenses and what they are used for


Every single person on the planet has a completely unique eyeball, in exactly the same way that everybody has a unique fingerprint your eyes are not even remotely like another person’s in the world, well on a microscopic level anyway and as such everybody has different levels of vision that require a unique strength and prescription of glasses in order to correct them should you have poorer vision than average.  An optician will be more than happy to sit and explain to you what makes up your glasses and how it will help your vision but the basic gist of what you need to know is that inside the glass on your “glasses” there are actually lenses like that of a camera.

When installed into the glass these lenses actually distort incoming light before they enter your eyes and reforms it too be seen at the optimal frequency and patterning for the lenses in your eyes (yes they are inside your eyeball too!). With everybody’s eyes being different it’s no wonder that there are countless types of different lenses available and at differing strengths and combinations, you will actually see this if you have ever had the test where they try multiple different combinations in dummy glasses. So let’s take a look at some of these types and what exactly how they are used to treat different conditions.


Astigmatism itself is defined as an unusual curving of the cornea that causes blurring stretching and distortion to the sufferer’s vision. The severity of it can range from mild distortion and stretching of text and other fine details in a pattern to more severe forms that require heavy prescription lenses to correct. Often times these symptoms become more pronounced with small text and illuminated screens like televisions or computer monitors making reading and watching movies and TV programs much more difficult. There are also three different kinds of astigmatism: Myopic, Hyperopic and Mixed, these are indicative of whether the nearsighted or long sighted meridians are disturbed.

The kinds of corrective options open to sufferers of Astigmatism are wide and varied however many different solutions that assist with problems like near and farsightedness can also be used with cases of astigmatism with some customization to match the distortion level found in the eye. However some sufferers have also turned to using gas permeable contact lenses which provide high powered rigid replacement (optically speaking ) of the affected cornea, taking the burdens of its job away and correcting the light as it enters your eye, causing less distortion to the already distorted view of the sufferer.


Presbyopia is an age-related condition in which results in the sufferer having extremely blurred near vision. It typically only develops in those over the age of 40 and is a fairly common complaint that optometrists hear. It is caused by the natural lenses found in your eye becoming harder, stiffer and less elastic causing it to react slower and with less detail than it would have done originally. Often people with presbyopia will start off small perhaps by having to walk up very close to read signs with fairly large lettering or squinting at smaller writing that isn’t too great of a distance away from you. This is one of the early indicators that you may be suffering with presbyopia.

Generally speaking there are two kinds of treatment that most optometrists would recommend for a sufferer with presbyopia;

1.      Bifocal lenses

These lenses generally have a split field of focus and have one-half dedicated to correcting any problems that you may have with your long range vision and at the same time the other half of your glasses will be for near focus and things like reading. These are the kind of glasses seen being worn by the older generation and generally, presbyopia is the culprit.

2.      Progressive lenses

Progressive lenses, unlike the rather limited by comparison bifocals do not rely on merely two strengths of prescription to deal with the problem many different strengths all at the same time using what is called a “multifocal” lens providing any level of strength needed for the focus at hand.

You will have to discuss with your optician about what solution he feels would work best for you. Please click the following link for more information about presbyopic glasses.

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