The disease starts out as increased tear production, progressing to a cloudy appearance on the surface of the eye (cornea), and further progressing to a swollen pink eye (increased blood vessels) with a yellow ulcerated centre.

Source: https://condobolinargus.com.au/farmers-urged-to-keep-an-eye-out-for-pinkeye/?utm_source=rss&utm_medium=rss&utm_campaign=farmers-urged-to-keep-an-eye-out-for-pinkeye

“The first sign of pinkeye is when the eye starts to weep and as the infection progresses, the membranes of the eye become red and swollen, eventually causing the eye to become cloudy and ulcerated.

Source: https://narrabricourier.com.au/2023/02/13/be-alert-about-pinkeye-in-livestock-during-summer-2/