(Storage)to be kept in a cool place.quality guarantee for three years.
(Expertise)the organic lens will aging and yellowing by oxidation and UV,and any rines will acc-elerated ageing and tum-yellow by the alcohol or alkaline washing (dishwashing).So,you re suggested to use the UltrasonicCleaning equipment or the AO lens cleaning expert to rinse and care your lens,that to prolong its usefull life.