to my surprise as i feel like my vision is worse after the four years since my last check up there was no change to my eyeglass prescription. but it turns out i have some dry eyes issues as my tear ducts are gunked up. i assured the optician it wasnt so much pollution that was the problem as a lack of empathy. i was sure this joke would lead to an instant rebate on my bill but i had to settle for a coupon for eye drops.