Synvael nope, he literally become Albino in sense he lose all pigment after grass trial, its not only white hair, its all: skin , eyes, hair and rest of his "fur"
As far as I know it takes another experiment to make witchers' eyes "special"

But I do not agree however, I think the side effects affected only his hair.

Here I quote from my italian version of the first book (sorry for any grammar mistake)
"Yeah, Kaer Morhen... There I suffered the ordinary mutation. The Trial of the Grasses, and then the usual things. Hormones, medical herbs, virus infections. And more. And more. In order to succeed. Apparently I have endured the changes in an exceptional way, I got sick in a very lightly way. Therefore I was considered a incredibly durable brat and chosen for others... experiments, more complicated. Here was worse. Much worse. But, as you see, I survived. The only one among the chosen for these experiments. Since then I have white hair. Total lack of pigment. How do you say... a side effect. A trifle. It does not give much trouble."