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Posts Tagged ‘vision’

Quantifying your pupillary distance:

This measurement is the distance between the centre of your pupils that is measured in millimetres.

Opticians do not tend to give out this measurement as it encourages patients to buy their spectacles from them whereas you can buy cheap spectacles online or designer glasses at a fraction of the price online. It is normally noted as 1 measure like 60 (60mm) but can also be presented as R 29 L 31. When penned in this way it is the individual space from your right and left pupils to the midline of your nose.

When Varifocals, High Prescriptions or Prisms are ordered the measurement is commonly split individually. Generally it is written as a single value for most single vision prescriptions.

If you do not know this measurement and don’t want to measure it yourself then most online opticians will make your PD the national average (63) for men and (60) for women.

You can ask a friend or family member to calculate your PD for you:

This will be by far the simplest means by obtaining your PD. Your friend will have to place a ruler above your eyes, just across your forehead.

Next ask your friend to close their right eye and you then look directly into their left eye. Request your colleague to slide the ruler to bring about the zero value is in the center of your right pupil and to keep the ruler very steady across your frontal bone. Subsequently, you will need your associate to shut their own left eye and you will need to look straight into their right eye.

Your acquaintance will then read off the measurement to the centre of your left pupil. And that is it! It really is that easy! Please see the diagram below to help you further.

Using your latest glasses to measure you PD with assistance from a friend:

Make sure that your glasses fit nicely by wearing them and seeing how they feel. Ask your friend to stand opposite you and mark on your lenses the position of your pupils with a non permanent marker.

You should now see two lines directly infront of you whilst you are wearing your glasses. Simply, take off your spectacles and measure the distance between the two markings. And that is it! If the ruler shows 6 cm then your pupillary distance will be termed as 60. If the measurement is 6.3cm then your PD will be 63.

If you have a varifocal measurement, then just measure across from your right eye to the centre of your nose and then again from the centre of your nose to your left eye and record the individual readings for both your left and right eyes. If you aren’t buying sunglasses with prescription lenses in then don’t worry about what’s in this article.

After years of being told that video games are bad for your health and especially your eyes, a new study has proved that in fact playing some games may actually help improve your vision, and could even prevent you from needing glasses in the future. The study, conducted by the University of Rochester, demonstrates that playing certain games improves a person’s contrast sensitivity function, or their ability to distinguish easily between different shades of grey. But can that really mean your eyesight has improved?

Shades of grey might not sound all that ground-breaking, but contrast sensitivity is one of the most commonly and easily damaged functions of the eye. People who suffer from low contrast sensitivity find it harder to see at night or to pick out small details like spots on clothing, and often the only way to treat the problem is with increasing strength prescription glasses or eye surgery. Some now believe that computer games could be used to train the eyes to develop these skills, and that it’s possible the same method could even be used to treat people who suffer from Amblyopia or ‘lazy eye’, a condition that affects the brain’s ability to correctly register signals from one eye.

But not all video games are thought to have this effect. The study compared different types of games by testing young adults who did not normally play games both before and after a period of playing them regularly. The results of the tests revealed that subjects who played first-person shooter or action games like Call of Duty showed a 43 per cent improvement on average, whereas those who played non-action games like The Sims 2 showed hardly any.

So if gaming could help us avoid eye problems should we all be rushing out to buy an XBOX with as many action games as we can find to ensure that our designer sunglasses will remain our only visual aids far into our future? Well, unfortunately no. For a start the study stresses that not all action games will work, in other words, the majority of them probably won’t. Not to mention the fact that although these games may help develop some areas of your sight, it’s still not advisable to be sitting in front of a screen for long periods of time, or to allow gaming to replace other activities necessary to staying fit and healthy. In theory it’s a nice idea, but it’s important not to forget that it’s just as possible that video games could be harmful in other ways.