Planning a road trip soon? Then pack extra Visine. A recent survey by Acuvue Advance and Sperling’s BestPlaces reveals certain cities are murder on your eyesight. Findings account for criteria such as altitude, humidity, pollution, and temperature, as well as variables like commute time and computer usage. According to the experts, here are the top five best and worst places to see things clearly.

Best Places For Eyes
1 Tacoma, Washington
2 Sarasota to Bradenton, Florida
3 Charleston - North Charleston, South Carolina
4 Mobile, Alabama
5 Portland, Oregon to Vancouver, Washington

Worst Places For Eyes
1 Denver, Colorado
2 Albuquerque, New Mexico
3 Salt Lake City to Ogden, Utah
4 Wichita, Kansas
5 Las Vegas, Nevada

— SCOTT STEINBERG