可以只验光的。
另外，如果你知道自己的度数，验光都不用，直接到网上去买好了，网站会问你你在哪个doctor验的光，你只要瞎编一个就可以了。

if you have medical insurance which covers vision, you should have a list of ophthalmologists in your area, you go there to get prescription and then go to an optician to buy contact lenses