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Ok thank you I will go get some vitamin AThere are many strains of Marek's. Not all are covered by the vaccine.
But this may not be Marek's. It could be something causing a vision disorder. Try giving her vitamin A, found where they sell human vitamins, each day for several weeks. Vitamin A deficiency can cause issues like this.
Everyone else is fineIt also looks like the ocular (eye form) of Mareks to me. Have you added any new birds to the flock recently? The Mareks vaccine takes 2 weeks to be effective and they can still be exposed to the virus. Have you seen the pinpoint pupils in any other chickens? This article about Mareks has a similar picture of an eye, and you may want to read the article:
https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/
Is there a certain mg I should get in the vitamin A?There are many strains of Marek's. Not all are covered by the vaccine.
But this may not be Marek's. It could be something causing a vision disorder. Try giving her vitamin A, found where they sell human vitamins, each day for several weeks. Vitamin A deficiency can cause issues like this.