In what scenario should a casualty with an eye injury be evacuated to a MTF as soon as possible?

The scenario where a casualty with an eye injury should be evacuated to a MTF as soon as possible is when they experience vision changes. Changes in vision can indicate a serious underlying issue, such as retinal detachment, hemorrhage within the eye, or damage to the optic nerve. These conditions pose a significant risk to the individual's eyesight and require immediate medical evaluation and intervention to prevent long-term damage or permanent vision loss.

In contrast, minor irritation typically does not necessitate urgent evacuation, as it can often be treated effectively with conservative measures. Covering the eye with a shield is a prudent step to protect it from further harm, but evacuation is still critical if vision is compromised. Severe pain can indicate a serious issue as well, but it is the changes in vision that directly correlate with potential threats to ocular function, making it paramount to prioritize such cases for immediate medical transport.