Computer activities are an important part of daily life: surfing the net, sending emails, working on a file, leaving a message on Facebook…
At the Santona Optic Centre we pay particular attention to vision problems related to the intense activity at the PC, for prevention, for the study of characteristics and limits of each vision system.
This thing requires an attentive exam, in which the optic-optometrist empathizes with you, he checks your vision abilities (accommodation, convergence, ametropia, eye movements), he relates them to the real way of use of the PC (posture, eye-screen distance, light conditions and contrast, hours per day spent at the PC, intensity of the requested activity), and so he proposes the best correction for the case.
Vision prevention at the PC
Occupational activities requiring a long use of the PC had a strong increase. During a long use of the computer, vision needs a high accommodation and it can give some vision problems called “screen syndrome”: dry eyes, eye stinging, clouded and undoubled vision, altered colors perception, eye heaviness, strong lacrimation, and photophobia. To prevent the screen syndrome is very important to respect some rules in front of the computer:
- Back and head erected, without inclinations
- Screen a little inclined, in order to have the upper edge of the screen at the same level of your eyes and the lower one about 40° downwards.
- Keyboard 40 cm under your shoulders level
- 50 or 60 cm between your eyes and the screen
- Illumination (natural or artificial) oriented in order to avoid annoying reflexes on the screen
- Short and regular breaks (10 minutes) every 2 hours
Computer and optic instruments for correction
Computer vision causes a strong accommodative commitment and a variable entity of convergence, according to the distance of work and the posture. This commitment can be added to personal vision problems (myopia, astigmatism, hypermetropia or presbyopia) or alteration of quality and quantity of lacrimal film, consequence of environment conditions at the office. You need a good vision flexibility, which allows you to move quickly and precisely your eyes from the keyboard to the screen, from your paper work to the calculating on the desk… Flexibility requested is also important for your vision with different distances: you need to think about it when you prescript glasses for PC to people with presbyopia. Monofocal lenses can represent a limit for people with presbyopia, because his eyes are always moving on objects at different distances. Progressive lenses give a clear vision at any distance, so they represent the best choice; but, sometimes, people with presbyopia are forced, by the screen position, to an abnormal posture of the head for a better use of the proximal vision. Indoor lenses are specific for an intense proximal activity and, in case of a long stay in front of the PC, can offer high quality performances: they give priority to the proximal vision but they also give a comfortable use until 120-150 cm. So indoor lenses give a clear close vision, but also dynamicity and comfort at medium distances, typical of desk activities.