Understanding your prescription 


Hi again!

These days with almost everyone using a computer, a new type of prescription lens is required.

In the past, when individuals reached mid-life they would normally require a reading correction. In other words a pair of prescription glasses that had an optical focus of around 300mm. If they were already wearing distance glasses they would move to a bifocal i.e. a lens where the top part is a distance prescription and the lower a reading add. The problem with this type of lens is it doesn’t make any allowance for a 600mm focal length which is an ideal distance for computer use.

So, enter progressive (or multifocal) lens. As the name suggests, standard progressive lens have three focal points; 1. distance, 2. intermediate (al la computer) and near for reading.

For the average person using a computer for short periods, the progressive glasses if fitted correctly should be satisfactory. By tilting the head upwards slightly the 600mm distance of the computer screen will be quite clear.

For others e.g. office workers who are on the computer for many hours a day, the constant head tilting to get the screen into view can cause discomfort and neck problems.

The solution is a pair of progressive office lens which allow for perfect 600mm vision for the computer and a near section for reading, necessary for data input. Although the top part of the lens is now designed for computer distance instead of far distance, most people can see well enough to converse without having to take their glasses off.

Computers are here to stay so if you are struggling with readers or standard progressive glasses (which are great for their own purposes), consider computer glasses.

I would love to hear from you, drop me an email telling me a bit about yourself. I am happy to answer any questions.


Barry Hewitt



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