Heat exhaustion: heavy sweating, weakness, nausea, headache, cool/clammy skin.
Heat stroke (life-threatening): hot/red/dry skin, confusion, fast pulse, altered consciousness. Call 911 now.
Signs: shivering (early), confusion, slurred speech, drowsiness, loss of shivering (late, dangerous).
Chemical splash: flush at eyewash station for at least 15 minutes, holding eye open. Get to ER after.
Foreign object: if it's loose, blink and try gentle flushing. Do not rub. If embedded, do not remove — cover with paper cup, get to ER.
Blow to eye: apply cold pack (not pressure). Loss of vision, blood in eye, or pain on eye movement → ER immediately.