Reproducing the natural light

The human body is designed to live in nature, according to rhythms dictated by the sunlight. Due to the natural production of serotonin (during daylight hours) and melatonin (during hours of darkness), our biorhythm makes us more productive during the day and more inclined to sleep at night. Even the seasons affect our biorhythms: in summer the most amount of light makes us more active, while in winter the lack of light makes us more tired and in need of rest. Working life, however, compels us to take a different rhythm, regulated by the requirements of productivity; the result of this “forced” adaptation is a source of considerable stress to our body. The most effective way to minimize this kind of stress is to make sure that the light received by our eyes in the work environment is as similar as possible (in quantity and in quality) to sunlight.
The overloading of the visual system is also harmful to the health of the eye. It manifests as various symptoms such as burning, tearing, dry eye, a feeling of foreign body, eye pain or discomfort, or even blurred vision or ghosting.

These disorders, in the long run, can cause diseases procuring a real lack of concentration, headaches over orbital and temples, redness, burning, or discomfort in the eyes even already in the morning when you wake up. A continuous exposure to a wrong light source can lead one to a set of direct or reflected pathologies. On the contrary, a good quality and flexibility of the vision is a prerequisite for your general welfare.
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The collateral effects of a wrong lighting

Modification of the biorhytm

Exposure to a source of light which is ineffective induces a sense of fatigue even in the hours usually dedicated to work.

Stress, tensions, headaches

Too much light or too much direct light causes stress, nervous tensions and headaches.

Eye diseases

The visual weariness, as well as generating a risk of serious eye diseases, can have an indirect effect on mood and perception of good health and emotional well-being

Neuralgia

The continuous use of a wrong light source may prompt physicians to assume unnatural postures, causing pain and pathologies of the musculoskeletal system.

And the patient?

The operating light is the element that is constantly in front of the eyes of the patient. A wrong light is a source of stress for him, who can be “blinded” at every movement of the lamp. This stress is inevitably reflected on the perception which he has of the doctor’s cabinet he is in. More relaxed is a patient, more willing to receive treatment and, last but not least, to come back in the dental cabinet.

 

Quality of light

When choosing a dental lamp you must consider some features for the determination of its quality of light. It is essential that artificial light is able to faithfully reproduce the colours of the materials and tissues which may appear different, depending on the colour temperature of the light source and the relative colour rendering. This is of fundamental importance for the success of the job. The colour temperature is measured in Kelvin (K): a lower value corresponds to a warmer colour tone which tends toward red. A higher colour temperature means cooler shades (green and blue). The reference “neutral” value of the colour temperature, “the pure white”, corresponds to the midday sun on a beautiful day and is about 5,000 K.

Even the sunlight affects colour perception: at changing of the seasons or hours of the day we see different colours. Therefore it is important to have a light source that, at any time, is able to give accurate informations to the doctor. All FARO lamps offer intensity adjustment so that the visual function can capture the tiny details of the operative field with minimal effort, constantly keeping the colour temperature at 5,000 K.

 

How much light?

The amount of light required to illuminate the operative field depends on several factors. Proper lighting must have characteristics of intensity, distribution and quality appropriate to the visual function of the physician, in order to capture the details of the operative field. Depending on the age of the physician, for example, it will require a higher or lower quantity of light. In addition, the smaller details will be observed, the greater the intensity of light is required. A good source of illumination must be adjustable, without losing its characteristics of colour temperature and illumination uniformity.

Managing the contrast

To avoid visual stress should be avoided excessive contrast between the working area and the surrounding environment; the continue need of adaptation to any movement of the eyes leads to an inevitable eye fatigue. It is therefore a good rule that the lighting of the workplace is higher than the one in the room, and, for a more comfortable visual activity, the light source should not be addressed directly to the eye: it must be disposed or behind or side or above the observer.

The glare

The glare, not only annoying, is potentially damaging because it can cause serious eye lesions on the retina. These lesions can be determined by a thermal effect (coagulation of proteins in the retina) or by a photochemical effect (chemical reactions, without raising the temperature). Especially children are exposed to this risk, as they are subject to the development of their natural defenses. The reflected light optical project FARO provides a defined spot and does not produce heat to minimize this phenomenon. In the case of patients with diagnosed eye diseases is also possible to obtain an overall screen through.

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