Here's another interesting case: a varifocal eyeglass wearer who drives a lot found that his varifocal glasses simply didn't work quite right. In spite of multiple fittings, he was still unhappy with his vision when driving. A ZEISS optician wanted to know why and decided to go for a drive with his patient. The cause of the problem was clear immediately. This varifocal eyeglass wearer had reclined his seat so far back that he was almost lying down – thus with this 'normal' varifocal lens design he had to look through the near vision or intermediate zones to see into the distance. He was only able to look through the distance range of the lenses by tilting his head in an extremely uncomfortable position. The optician was able to optimise this patient's varifocal glasses to accommodate his seated position when driving, providing the patient with comfortable vision.
Lorry drivers who wear varifocals spend their entire workday on the road and look through their glasses differently than someone driving a car. Lorry drivers bend their head slightly forward when looking at the road ahead because of the elevated sitting position, i.e. they are looking through the area on the varifocal lens where you typically find the intermediate zone. Thus it is especially helpful to optimise the lens design accordingly.
Did you know that there are ZEISS lenses which have been specially optimised for driving? You can wear DriveSafe lenses for the entire day. They feature a unique design and a special coating which demonstrate their strengths when you're driving: learn more about DriveSafe here.
Varifocals for pilots pose another particular challenge because pilots do not just look down at the instruments on the dashboard like someone driving a car. Depending on the type of airplane, pilots also need to look overhead at their instruments. Ideally they would have a second near zone / intermediate zone in the upper section of the lens.
Many jobs place unique demands on a person's vision, and varifocals must rise to these challenges. For comfortable vision, writers or graphic artists require a different design in the near zone than teachers, who often switch their gaze between the near zone and a particular intermediate distance in the classroom, or policemen who require good long-range vision as well as a clear mid distance zone for their daily work.
However, it's all about the fine details if you're a dentist or jeweller. Here a magnifying attachment for your glasses can help.
Many people require improved vision for looking at things up close rather than in the distance. But it's inconvenient for them to continually put on and take off their reading glasses. For these people, the ideal solution is varifocal glasses with prescription powers for only near and middle distance vision and none for distance.
There are also special varifocals for competitive sports. Optician who specialise in sports eyewear can recreate the conditions experienced by the wearer for the particular sport in a separate refraction room, measure the patient's particular viewing distances and thus incorporate the required vision zones. For example: a racing cyclist leans forward and looks through the varifocal lens completely differently than a long-distance runner, marksman, hunter or golfer.
Our eyes are our most important sense organ. And since each eye is as unique as a fingerprint, it requires a customised visual analysis at your optometrist.
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