Why do some young adults think it's cool to wear glasses withoutlenses? It might be because they don't undestand how to usetheir employers' vision benefits.

Vision benefits have become something of a standard expectationon an employer’s package of benefits, and 76 percent ofemployees are enrolled in such a program. There are two groupsof employees for whom the value just isn’t there, however.

According to the most recent survey on vision benefits fromTransitions Optical, millennial and Gen Z employees are significantly less likelyto enroll in or utilize a vision plan than their older peers--just50 percent of Gen Z and 75 percent of millennials reported beingenrolled.

Related: Why voluntary benefits are awin-win

The ninth-annual Employee Perceptions of Vision Benefits offersinsight and potential explanation for these findings, includingemployees’ lack of understanding the difference between acomprehensive eye exam and what might be provided during an annualvisit with their primary care doctor. More than 20 percent ofmillennials and Gen Zs don't think they need to have acomprehensive eye exam if they've had a vision test performed bytheir physician. Among older generations, only 8 percent feel thesame.

It should come as no surprise, then, that the two younger groupsalso rated having annual eye exams as less important than employeesoverall.

They might not understand vision health or their visionbenefits, but the younger generations are keen on learning. More than half of Millennials surveyed (56 percent) said theywould be "much more" likely use their vision benefits if theybetter understood them.

Other findings from the survey include:

• Six in 10 employees say full coverage of premium lens options orenhancements would help motivate them to enroll in a plan.

• More than half of employees would be more likely to enroll intheir company's vision plan if they better understood that eyeexams could provide early detection of serious health issues.

• Of eyeglass wearers specifically, 85 percent of employees saythey would be willing to pay more for a vision plan that fullycovers premium eyewear options.

Looking trendy might also be an incentive to increase enrollmentand utilization of vision benefits, the survey suggests. Nine in 10eyeglass wearers (92 percent) say they would be more likely toschedule an eye exam within the next 12 months if their vision plancovered one or more premium lens options. So those young adults canstill rock a pair of full-rimmed glasses (or whatever other stylesuits them) -- just with appropriate corrective lenses.