Is finding plaque in the eye an indication of an imminent stroke? is there a non-invasive way to address the condition?

A visible retinal plaque in the vasculature is indicative of an embolism and certainly does raise concern that you are at risk. The management complexities are beyond the scope of this site and would urge a direct visit to your doctor ASAP.

It is recommended to refer a patient with a symptomatic retinal plaque to a stroke center for urgent evaluation - there is a high risk of a full stroke. The symptoms include a temporary black out of vision or part of the vision (TIA), or the presence of a branch or central retinal artery occlusion with the plaque. Asymptomatic retinal plaques are much lower risk and may be present for years.

If you are asymptomatic and the retinal plaque was visualized during a routine retinal exam, I would not worry much at your age of 93 years old. However, if you have had symptoms such as transient blindness or transient focal neurological symptoms you should be evaluated as soon as possible by a neurovascular team.