When it rains the lane markings become almost invisible. Even in the daylight it is hard to see, but at night it is much harder.
Would installing a specific color of foglights help? Would it help to use polarized lenses?
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There is not much you can do to support seeing lane markings.
I would still visit an eye specialist (especially if you are getting old) because you can have nyctalopia (the inability to see the lane markings on low light is one warning sign) or photophobia, sensitivity to light (the rain causes strong light reflexes which does not allow the eye to see correctly).
It is independent of how good you see at day, your day vision could be completely perfect. Many people do not realize how bad their night vision is because it deteoriates imperceptibly.