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Guide dogs help people who can't see.
Literal
Guide-dog [topic-は] eye [possessive-の] not-visible people [object-を] help.
盲導犬 ('guide dog') is a Sino-Japanese compound — 盲 ('blind') + 導 ('guide') + 犬 ('dog'). 目の見えない人 ('a person whose eyes are not visible / who cannot see') is the common, neutral way to say 'blind person' in contemporary Japanese. The relative clause 目の見えない modifies 人, with の rather than が inside the relative clause — a common variation when there's no ambiguity.