If you have glaucoma in both eyes, usually only one eye will be treated at a time. Laser treatments for each eye will be scheduled several days to several weeks apart. Studies show that laser surgery can be very good at reducing the pressure in some patients. However, its effects can wear off over time.
The statute of limitations pertaining to customer initiated chargebacks is 18 months from the time the transaction appears on the statements. So, for chargeback purposes it is important to keep you business credit card receipts for 18 month.
Employee time cards should be kept for at least two years. For  employee leave and absences, records should be kept for at least  three years.ou should keep employees time cards for at least one year. This  will allow for easy reference if any dispute arises when filing tax  forms.