ANSWERS: 1
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Depending on the intensity of the spark, eye damage could be temporary, just as watching a camera flash can cause temporary blindness. Probably, more serious damage can result from driving with the sun shining into your eyes, even obliquely. I would be more concerned about why someone was attempting to connect wires witout switching off and isolating the circuit unless they happened to ba a licensed electrician, in which case they would be aware of the dangers.
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