A person is more likely to become visually impaired as that person ages. Among adults in the state of Illinois, however, the proportion receiving benefit payments from their vision insurance shrinks from 56 percent among 50-64 year olds to 24 percent for those aged 65-79, and 13 percent for those aged 79 and older. The explanation of this discrepancy is that the proportion of jobs offering such an insurance benefit has greatly increased in recent years. Which one of the following, if true about Illinois, shows that the explanation above is, at best, incomplete? ["Under most employers' plans, vision insurance payments stop when a visually impaired employee reaches the usual retirement age of 65.", "Medical advances have improved the average person's vision beyond what it was 20 years ago.", 'The treatment of newly incurred visual impairments is more successful now than in the past in restoring vision.', 'For persons receiving vision insurance benefit payments, those payments on average represent a smaller share of their income now than was the case 20 years ago.']