UV rays can pass through the holes and spaces of loosely knit fabrics. Be careful during routine outdoor activities such as gardening or playing sports. Remember that UV exposure is especially strong if you are working or playing between the peak hours of 10 a.m. and 4 p.m. Don't forget that spectators, as well as participants, need to wear sunscreen and eye protection to avoid too much sun. Fair-skinned people might burn in less than 5 minutes.
Outdoor workers are especially at risk as are vacationers who can receive very intense sun exposure.
Minimize sun exposure during midday hours, from 10 a.m. to 4 p.m. Avoid being in the sun as much as possible. Some reduction in blue light also might be beneficial but colors should not be severely distorted. Wear a cap or hat with a wide brim, which will block roughly 50 percent of UV radiation from reaching the eyes. Wearing sunglasses as well can block the remainder of UV rays.