Laservision USA
Eyewear Resources FAQ

 

Eyewear Resources FAQ


Q: How long will my glasses protect me?

A: There is no simple answer to this question. Some glasses are worn-out after only one year, while others look like new after four years. This depends on several factors such as careful treatment, proper care, and environmental factors. A pair of glasses that are treated with care, cleaned according to instructions and used in a laboratory setting will certainly outlast a pair of glasses that are treated carelessly and perhaps even worn by several different people in a rough production environment.

Glasses that show any damage whatsoever (e.g. a damaged or scratched filter, color changes in the filter, damaged metal enforcement on the inside of the frames) should not be used. If you are in doubt, please contact our technical support for a safety inspection of your glasses.


Q: Can you repair laser safety glasses?

A: Yes, of course. We repair frames and replace damaged filters. Simply contact one of our customer representatives and secure a return authorization for all product service and repairs.


Q: Can I look right into the laser beam with my laser safety glasses?

A: Laser safety glasses are designed to protect your eyes against an accidental direct hit of the laser beam. They are not designed for long-term or intrabeam laser viewing conditions.


Q: You have coated red filters. Can I have the glasses with a different color?

A: The color of absorption filters cannot be chosen at random, but depends on the wavelength the filters protect against. To protect against wavelengths in the UV-region or the lower visible (blue radiation), the yellow or orange filter is usually recommended. A red filter is usually used to protect against wavelengths in the green region. Please take into consideration that you may not select glasses by the color only. Always make sure that the quoted or available pair of glasses matches the requirements of your laser.


Q: I have a pair of glasses (e.g. for a Nd:YAG Laser). Can I use them for my new laser as well?

A: Before this question can be answered you must determine the specific requirements of your new laser (wavelength, operational parameters, viewing conditions, etc). When these parameters are known, verify that the marking on your existing pair of glasses matches these requirements. If you are not sure, please call us. We will carry out the calculation and check for you. Please note: The thoughtless use of a pair of laser safety glasses for a different application (different wavelength or different power/energy than calculated before) may cause the loss of your eyesight.


Q: Why is there no pair of glasses covering all my lasers?

A: The radiation that is visible to humans lies between 380-780 nm (the exact limits are different in each person). In order to cover all lasers you would need a material that does not transmit any radiation for visible radiation, which means it is completely black. When you block all visible radiation, the only wavelengths left are invisible to the human eye.

If you have several lasers in this area, then it is necessary to use several pairs of glasses. But even if you do not want to completely block all wavelengths or have 'just a few wavelengths' to cover, the glasses may be too dark. Usually the protection within a material slowly increases until it reaches the required protection level at a given wavelength. This means that it not only covers the required wavelength but also areas below and above it (with lower Optical Density). Therefore, if you want to cover several wavelengths in the visible spectrum the Optical Density curves will overlap resulting in dark filters or glasses.


Q: Do you have laser safety glasses with "Class 4"?

A: The term "class 4" is the laser classification according to ANSI Z136.1 and EN 60825-1. Class 4 designation means that this is a dangerous laser and is an eye, skin and fire hazard. When you work with this laser, laser protective eyewear is mandatory. This classification, however, does not include any information regarding the wavelengths or the required protection levels that the glasses must protect against.