Youwillneedtogiveathoroughhistoryofyourdog'shealth,onsetofsymptoms,asfarasyouhavebeenabletotell,andpossibleincidentsthatmighthaveprecededthiscondition,suchasinjuriestotheeye(eventhosewhichyouconsiderminor).
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You will need to give a thorough history of your dog's health, onset of symptoms, as far as you have been able to tell, and possible incidents that might have preceded this condition, such as injuries to the eye (even those which you consider minor).