Variations of computer eyeglasses for CVS
Computer focus has unique visual demands that are unlike with other activities, like reading or cooking. In this case, a prolonged computer use may bring eyestrain and fatigue more easily. Some of the people under 40 can not remain accurately focused on the computer screen for a long period, or get tired from the frequent switches between the screen and the keyboard. Presbyopia on people above 40 may also cause CVS (Computer Vision Syndrome) symptoms such as blurry vision and headache.
The reason for eyestrain and stress during computer work
All of the related symptoms caused by computer use are categorized into computer vision syndrome. In fact, eye strain and stress are the slightest signs. Some PC users even experience headache on occasion because they spend consecutive hours on the computer screen. Worse conditions include eye irritation and itchiness. What is the exact cause of these symptoms? Well, most people’s eyes are not accustomed to computer work, which requires the eyes to stay in an intermediate vision zone. Both close vision and distance vision differ more or less from this viewing zone. In simple words, the eyes get easily strained and more serious conditions may follow.
Computer glasses are the perfect solution to CVS
The simplest way to address CVS is specially designed computer glasses, which are superior to regular prescription glasses. All those commonly used prescription glasses such as reading glasses, bifocal glasses and single vision glasses for myopia are not designed for computer use. The reason is that computer focus needs the intermediate zone of vision, which is closer than distance vision and farther than near vision. Even trifocals and progressive glasses can only cover a small portion of this area.
A study proved the effectiveness of computer glasses
The University Of Alabama School Of Optometry has conducted a research recruiting participants between 19 and 30, who either wear computer glasses or non-corrective glasses. Researchers recorded the performance of these people in finishing font tests. The result showed that subjects with computer glasses had higher work productivity than the other individuals.
Some variations of multifocal glasses also support computer work
Computer glasses have special designs that are not suitable for regular wear. A single vision lens with special power provides both the most comfortable computer vision and the largest vision field. This type of computer lens design reduces the risk of eyestrain, blurred vision and unnatural posture. For people with presbyopia, occupational progressive lenses or lined trifocals with larger intermediate zone provide the right solution. But they are not suitable for driving since the distance zone is narrowed. Occupational bifocal lenses offer a top lens part for intermediate vision and a bottom part for near vision.