The sun and our eyes
Among the rays of the sun, they are having a marked effect on our eyes:
• Ultraviolet (UV):
UVA: the cornea are particularly affected, so we should not forget to protect ourselves from them, as they may lead to cataracts.
UVB particularly affected the surface of the cornea.
• The infrared (IR)
• The visible rays: its range is 360nm to 740nm.
We have natural protective mechanisms, such as contraction of the pupil and eyelid closure. However, these mechanisms are not activated unless the visible rays are intense and dazzling as they do not detect the invisible rays (UV and IR). It is therefore important to protect. In fact we have to become aware that the eyelids are a part of our body that we do not consider when protecting against the sun's harmful rays, but the skin is very sensitive and delicate in that area and therefore more exposed to suffer skin cancer or basal cell carcinoma.
Prolonged exposure to these rays increases the risk of diseases such as cataracts, AMD ...
The eyes of the children still do not filter enough sunlight, so it is essential to protect sunglasses adapted.
According to WHO (World Health Organization), the manifest deterioration in the atmospheric ozone layer amplifies the action of UV rays on the eyes. This phenomenon most likely entail a sharp increase in the number of cataracts in the coming years.
How to choose your sunglasses?
The first rule of thumb is to choose sunglasses comply with European requirements (CE). Also make sure the quality of the crystals, the rate of protection should be selected according to their needs. Finally, the frame must cover well and be well adjusted to his face. To choose the sunglasses that best suit you is essential as advised by your optician.
What should you look for?
Verify that the glasses carry the CE mark guarantees that respect the rules of the European Union.
(http://www.essilor.es/lentesessilor/Materias/Paginas/EssilorAirwear.aspx) because it is invulnerable to the blows and ensures protection against UV rays 100%.
The material quality of the crystals defines the level of filtration to protect your eyes. The ideal material for glazing is polycarbonate Airwear
The tinted glass that do not filter UV rays need to be banned because they encourage the pupil to open, allowing more UV rays pass.
The tinted sunglasses
There are three main types of tinted sunglasses: gray, gray-green and brown.
With the glasses gray or gray-green, the reflection of colors is similar to your vision without glasses.
The brown lenses enhance contrast and colors reflect the "warm".
Depending on the tint of your glasses, you may feel a greater visual comfort. Often prefer to wear brown lenses myopic, hyperopic while the crystals prefer gray or gray-green.
If the brown fog greatly increases the contrast and allows better perception of relief. Although there are specific tones lenses for certain activities, see for example:
Luminal yellow hue is especially suitable for heavy fog.
Green color gradient, for computer users Crizal Forte + UV glare
The crystals specific solar
The photochromic lenses or Essilor Transitions:
In the absence of sunlight, these lenses remain clear and can be used indoors. Outside darken with UV rays thus offering protection against the glare between.
Recommended for people who develop a major outdoor activity because it allows the use of a single pair of glasses.
In case of high luminosity, the tinted lens is not sufficient transitions. Will need a pair of classic sunglasses to be free from glare.
Polarized lenses Essilor Xperio (http://www.essilor.es/lentesessilor/lentessolaresessicolor/Paginas/Xperio.aspx) These lenses will filter certain directions of light to reduce glare effects. Suppress glare and allow you to see fish under water from a boat or the driver of a car through your windshield
What degree of protection to choose?
The category of protection reduce glare and should be chosen depending on the luminosity at which you are exposed. In his view is indicated by a sticker on the lens.
Strongly colored lenses (category 4) are recommended for winter sports activities and water sports, as the snow and the water's surface reflects sunlight greatly.
There are 5 categories of filter based on the degree of absorption of ultraviolet rays, click here to view the table.
What frame you choose?
The further cover the mounting face, the greater the sunscreen. The sun's rays will not pass over, under or over the sides of the frame.
The sunglasses are also a fashion accessory, it is necessary especially likes the saddle. And for your convenience, it is essential that they are setting an optician.
• Make regular breaks on average every hour for near vision work looking as far as possible.
• Make sport and outdoor exercise. These activities are beneficial to the "visual relief".
Contact lenses are recommended to correct visual defects such as nearsightedness, farsightedness, astigmatism and presbyopia in some cases.
Contact lenses have become a complementary alternative to traditional glasses.
The types of lenses and flexible depending on time of use
• conventional soft lenses: They are renewed each year on average, require daily maintenance.
• daily soft lenses: They are renewed each day, require no maintenance.
• fortnightly soft lenses: They are renewed every 15 days, usually require daily maintenance.
• monthly soft lenses: They are renewed each month, usually require daily maintenance.
• Quarterly soft lenses: They are renewed every 3 months, usually require daily maintenance.
How to use contact lenses?
Get used to handling your lenses:
- On a clean and uncluttered in case one gets out (in that case, wash with a solution of proper maintenance).
- Still in the same order (the right and then left for example) to avoid confusion.
Compliance with the conditions of hygiene and keeping your lens guarantees a safe and comfortable use. The main problems related to the use of contact lenses due to poor maintenance. To be effective, the maintenance of the lenses must be made daily.
The single-use contact lenses
do not need no cleaning or disinfection, as you use a new lens each day.
The other types of contact lenses
Should be cleaned, rinsed and sanitized using a tailored maintenance solution each time lenses are removed.
Contact lens solutions are intended to enable him contact lenses safely, comfortably and keep them clean without contamination. Cleaned, disinfected, rinsed, lubricate, maintain and remove protein debris.
Tips for use and conditions of hygiene
• Never wear lenses in the pool without having spoken earlier with your optician.
• Do not ever give your contact lenses.
• Always wash your hands and dry with a towel before handling your lenses.
• Upgrade your kit with each new bottle of solution maintenance.
• Pull your contact lenses if they have been in contact with an infected eye.
It is recommended that contact lenses do not use without permission from your optician in the following circumstances:
• allergy, infection, irritation affecting your eyes or eyelids.
• Use of certain medications, including an eye treatment.
In case you are between a chemical in the eyes:
1. Remove contact lenses.
2. Wash copiously.
3. Promptly contact your ophthalmologist or a hospital emergency room and tell them what product has been.
In the event of difficulties:
You must remove the lenses if vision becomes double, if you have any trouble, if the eye is red, if you burn or if any abnormal sensation and then must go to your optician to get checked out.