VSP did not speculate on why cities such as Reno and Boise were attentive to eye care while Clevelanders, Akronites and folks from five California cities missed their annual appointments. But the top-ranking towns are consistent. The last time VSP produced the index in 2014, the same two cities ranked one and two, although Boise was tops that year, with Reno second.

This year, the cities were close: 45 percent of Reno clients got their eyes checked, while 43 percent of those in Boise went for the annual check-up.

Oklahoma City plan members finished third both years. It is the only city to rank among the top 10 every time since the index was started in 2012.

A company spokesperson said other research has indicated that people who take care of their eyesight tend to take care of their health in general. A study by HCMS determined that people who receive an annual comprehensive eye exam are more likely to enter the health care system earlier for treatment of serious health conditions, thereby significantly reducing their long-term cost of care. Additionally, people are more likely to get an annual comprehensive eye exam than a routine physical.

Now, let's get our eyes back on the prize, and take a good look at the best and worst towns for eye health. Based on the research, here are the Top 10 and Bottom 10 in eye health:

The top 10

1. Reno, Nevada.

2. Boise, Idaho.

3. Oklahoma City, Oklahoma.

4. Des Moines, Iowa.

5. Raleigh, North Carolina.

6. Redding, California.

7. Colorado Springs, Colorado.

8. Fayetteville, Arkansas.

9. Denver, Colorado.

10. Tulsa, Oklahoma

The bottom 10

1. Cleveland, Ohio.

2. Bakersfield, California.

3. Merced, California.

4. Akron, Ohio.

5. Albuquerque, New Mexico.

6. Detroit, Michigan.

7. Stockton, California.

8. Santa Rosa, California.

9. Bridgeport, Connecticut.

10. Salinas, California.