Check a poster for low-vision readers

Review [POSTER DESCRIPTION OR IMAGE] for [DELIVERY CHANNEL]. Identify the core message, reading order, minimum viable text size, contrast risks, crowded areas and whether important information is embedded only in the image. Create a revised layout brief and matching plain-text post that carries the same action and link. Give a test plan at phone size, 200% zoom and grayscale. If the actual file is unavailable, label the review as a brief rather than a visual inspection. Do not invent measured contrast ratios or promise accessibility without testing.