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.
How long you should keep a receipt depends on what it is for. A receipt for merchandise covered by a warranty needs to be filed away safely at least until the warranty runs out. Keep receipts for large purchases until you no longer own the item. For example, suppose you purchase a $4,000 cedar wardrobe and you later decide to sell it. With the receipt, you can show potential buyers the original purchase price. You may also need it for insurance purposes should something happen to the piece.