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Faq
The FAQ below are edited by Commissione Difesa Vista.
If you don't find the answer that you were looking for, write to us. Commissione Difesa Vista will be glad to answer.
Nocturnal myopia
At night we are all myopic...Nocturnal myopia is largely caused by increased dilation of the pupil, which results in an excessive elongation of the eyeball, thus rendering the eye myopic (from 0.7 to 1.5 diopters). Therefore, for night driving it is a good idea to uses lenses with a different prescription than for daytime use.Peripheral vision
At night the central and nearby surrounding area of the eyes become blind, while lateral vision is not altered. An object observed with peripheral vision attracts the eye, but when the gaze is fixed upon it, the object disappears. Furthermore, at night only objects with high contrast are clearly visible.
At night we are all myopic...Nocturnal myopia is largely caused by increased dilation of the pupil, which results in an excessive elongation of the eyeball, thus rendering the eye myopic (from 0.7 to 1.5 diopters). Therefore, for night driving it is a good idea to uses lenses with a different prescription than for daytime use.Peripheral vision
At night the central and nearby surrounding area of the eyes become blind, while lateral vision is not altered. An object observed with peripheral vision attracts the eye, but when the gaze is fixed upon it, the object disappears. Furthermore, at night only objects with high contrast are clearly visible.
After 40 almost everyone needs to wear glasses. The eyes' ability to focus is no longer as flexible as it was in youth. - link con la presbiopia.
It is a good idea to have a general eye exam at least once a year to determine visual acuity. Even slight vision defects should be detected as early as possible, even though they may not be readily apparent. Over time, if left uncorrected, they can lead to impairment of normal activity. It is especially important, after age 40, to schedule an ophthalmologic exam to check for possible pathologies and an optometric exam to evaluate visual acuity.
It is a good idea to have a general eye exam at least once a year to determine visual acuity. Even slight vision defects should be detected as early as possible, even though they may not be readily apparent. Over time, if left uncorrected, they can lead to impairment of normal activity. It is especially important, after age 40, to schedule an ophthalmologic exam to check for possible pathologies and an optometric exam to evaluate visual acuity.
There are three kinds of sunlenses: standard or normal, polarized and photochromic. Polarized lenses not only protect the eyes from radiation but also help screen out glare and can improve visibility, especially on sunny roads, on highly reflective water surfaces, etc. Photocromic lenses automatically adjust the filtering power of the lenses under different conditions, based on the amount of UV rays contained in solar radiation. This kind of eyewear is convenient because it can be worn all the time, indoors and out.
Mirroring involves a coating process applied to lenses and can be useful in high-intensity light situations, as occur at high altitudes and on snowfields or glaciers. Colored lenses can also ensure the same protective effects. Lenses also differ in terms of screening power. For example, in town or at sea level, light conditions are quite different from those found in the mountains or in snow, where greater screening power is required, both for the eyes and for the skin. This means it is also important to check the filtering power of lenses, which is based on a scale defined in another European standard: En 1836/97.
Lens Categories and Descriptions of Use:
Cat. 0 - 1 for interior environments, fashion accessories, or for use on dark days without strong light (wind protection). Transparent or provide weak or light filtration
Cat. 2 for average light conditions, cloudy skies, in town, etc. average filtration
Cat. 3 general use in full sun, dark filter
Cat. 4 for use in very bright light, mountaineering, highly reflective surfaces, etc. very dark filters (not safe for driving!)
Mirroring involves a coating process applied to lenses and can be useful in high-intensity light situations, as occur at high altitudes and on snowfields or glaciers. Colored lenses can also ensure the same protective effects. Lenses also differ in terms of screening power. For example, in town or at sea level, light conditions are quite different from those found in the mountains or in snow, where greater screening power is required, both for the eyes and for the skin. This means it is also important to check the filtering power of lenses, which is based on a scale defined in another European standard: En 1836/97.
Lens Categories and Descriptions of Use:
Cat. 0 - 1 for interior environments, fashion accessories, or for use on dark days without strong light (wind protection). Transparent or provide weak or light filtration
Cat. 2 for average light conditions, cloudy skies, in town, etc. average filtration
Cat. 3 general use in full sun, dark filter
Cat. 4 for use in very bright light, mountaineering, highly reflective surfaces, etc. very dark filters (not safe for driving!)
Behavior
Physical indications
- Squints, especially for distance vision.
- Holds objects unusually close or far away.
- Complains of double vision or a stiff neck
- Intolerance to light
- Pressing of the hands over closed eyes
- At one month, does not fix gaze on people or objects 6 feet (2 mt.) away
- Continuous or jerky movement of the eyes
- Doesn't perceive obstacles
Physical indications
- Misalignment of the eyes, cross-eyes
- Extremely small eyes or voluminous eyes that don't open properly
- Persistent or abundant tearing
- Milky, cloudy cornea
Amblyopia: occurs when the vision in one eye develops poorly, while vision in the other forms normally. The amblyopic eye, or "lazy" eye, is used less during the development process and is less sensitive than the other, and therefore does not see well. Usually the child does not complain about this problem and should be checked for the disorder from the first months after birth up to 2-3 years of age. It is difficult to treat amblyopia after the age of 4, while treatment before that age can allow vision recovery.
Astigmatism: a defect caused by asymmetrical curvature of the cornea that makes focusing difficult. Slight forms can cause headache and tiredness. Severe forms can result in poor focus at any distance.
Hypermetropia: this disorder is experienced as tiredness of the eyes caused by over-accommodation due to defective refraction. The overwork of one or both eyes can cause burning and headaches.
Myopia: distance vision is impaired. The child may squint or try to move closer to objects in an attempt to fine-tune the focus, or avoid activities that require distance perception.
Strabismus: or cross-eyes. Strabismus arises when the eyes are not properly aligned. One, or sometimes both, of the eyes may be turned inward toward the nose (estropia-convergent), or outward, toward the temples (extropia-divergent). But there are also vertical disorders (upward-hypertropia, or downward - hypotropia). Strabismus is one of the factors leading to amblyopia. Some very young children may display symptoms of false strabismus, in cases where the nasal septum is not fully developed. Folds of skin cover part of the internal corner of the eyes, creating what looks like convergent strabismus. Intermittent symptoms of strabismus can be normal in the first 4-6 months. If, however, after 6 months, the eyes have not aligned properly, it is advisable to have the infant's eyes examined.
Astigmatism: a defect caused by asymmetrical curvature of the cornea that makes focusing difficult. Slight forms can cause headache and tiredness. Severe forms can result in poor focus at any distance.
Hypermetropia: this disorder is experienced as tiredness of the eyes caused by over-accommodation due to defective refraction. The overwork of one or both eyes can cause burning and headaches.
Myopia: distance vision is impaired. The child may squint or try to move closer to objects in an attempt to fine-tune the focus, or avoid activities that require distance perception.
Strabismus: or cross-eyes. Strabismus arises when the eyes are not properly aligned. One, or sometimes both, of the eyes may be turned inward toward the nose (estropia-convergent), or outward, toward the temples (extropia-divergent). But there are also vertical disorders (upward-hypertropia, or downward - hypotropia). Strabismus is one of the factors leading to amblyopia. Some very young children may display symptoms of false strabismus, in cases where the nasal septum is not fully developed. Folds of skin cover part of the internal corner of the eyes, creating what looks like convergent strabismus. Intermittent symptoms of strabismus can be normal in the first 4-6 months. If, however, after 6 months, the eyes have not aligned properly, it is advisable to have the infant's eyes examined.