refractive

基本解释

Most insurance companies do not cover the cost of refractive surgery.
但大多数保险公司却并不支付屈光手术的费用。
The cost of refractive surgery varies in different locations, but it can be a significant expense.
不同地区屈光手术的费用也各不相同，但这笔费用往往是可观的。
Most people who have refractive surgery eventually attain 20/25 or better vision. Your chances for improved vision are based, in part, on how good your vision was before surgery.
大部分接受屈光手术的人最终得到20/25或更好的视力，视力提高的可能性部分取决于你手术前视力有多好。

They call it Netra, which means eye in Sanskrit but stands for Near Eye Tool for Refractive Assessment.

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When light travels through glass, it slows down (the amount it slows is measured by a number called the refractive index).
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