Meaning of 妄想盲 in Japanese

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Definition of 妄想盲

もうそう(mousou) · ぼうそう(bousou) 【妄想 ·盲想】

(n, vs) wild idea; delusion
あの少女は自分が王女様だという妄想にとらわれている。
That girl is under the delusion that she is a princess.

めくら(mekura) · めしい(meshii) 【盲 ·瞽】

(n) blindness; blind person
盲馬にはうなずいても目配せしても同じこと。
A nod is as good as a wink to a blind horse.
illiteracy; illiterate person
ignorance; ignoramus