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The Driving and Vehicle Licensing Agency (DVLA) set visual standards that must be met for a person to drive a motor vehicle. It is the responsibility of the driver to ensure that these standards are achieved before they drive. Visual ability is measured as what is seen with glasses on (or contact lenses) if needed, and with both eyes open.


The rules vary for cars and heavy goods vehicles. For cars, the take home points are that you must be able to read a number plate at 20m, have sufficient field of vision, and do not have double vision. Any condition that interferes with this should be assessed by your optometrist. While no health care professional is in a position to remove your license, they will be able to advise you a good way forward.


WHAT IS A CATARACT?


This is the most common reversible cause of sight loss in the world. It is a clouding of the lens inside the eye, which sits just behind the coloured bit of your eye (the iris). There are a number of causes, the most common being light passing through the lens over years causing the proteins in the lens to change shape. This causes the lens to become opaque. Symptoms include blurred vision and glare.


Cataract is treated with an operation to remove the old lens and replace it with a new one. This is the most commonly performed operation in the UK. It is incredibly safe and with modern lens technology, exceptional visual results are the norm.


I HAVE HEARD OF DRY AND WET MACULAR DEGENERATION – WHAT IS THE DIFFERENCE?


If your eye was a camera, the retina would be the film (or light


sensor in digital cameras) at the back. It senses the light that enters your eye and sends an image to your brain. The macula is the part of your retina responsible for your central vision. It is like an energy-hungry factory, constantly on the go and in doing this it produces waste products that can build up underneath the retina. We call this dry age-related macular degeneration (ARMD). Occasionally these waste products get in the way of the blood supply to the retina and the body tries to grow new blood vessels to get round the problem. We call this wet age-related macular degeneration.


While the wet form is generally more visually debilitating, there are effective treatments. If you develop new-onset distortion of vision, then please do consult your optometrist as soon as possible. Distorted vision can be the result of other retinal conditions, some of which may require surgery.


I understand this article won’t answer all questions, though I hope it is helpful in addressing some of the more common queries.


Mr George Morphis, Consultant Ophthalmologist and Cataract and Retinal Specialist, Hereford Vision, in association with Nuffield Health. 01432 370874 www.herefordvision.com


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