Their daughter Mia was just three years old when Canadian couple Edith Lemay and Sebastien Pelletier first noticed that she was having vision problems.A few years after they first took her to see a specialist, Mia, the eldest of their four children, was diagnosed with retinitis pigmentosa, a rare genetic condition that causes a loss or decline in vision over time.By this point, Lemay and Pelletier, who've been married for 12 years, had noticed that two of their sons, Colin, now seven, and Lauren
