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.
Receipts for income tax payments and other bills related to it must be kept for three years. The Internal Revenue System conducts audit every three years. It will be at your advantage to keep receipts that are vital for your tax deduction as well as credits that you have availed in your tax.