(CNN) — 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 Laurent, now five, were experiencing the same symptoms.
Their fears were confirmed when in 2019 the boys were diagnosed with the same genetic disorder; their other son Leo, now nine, was given the all clear.
"There's nothing you can really do," says Lemay, explaining that there is currently no cure or effective treatment to slow down the progression of retinitis pigmentosa.
"We don't know how fast it's going to go, but we expect them to be completely blind by mid-life."
Edith Lemay with husband Sébastian Pelletier and their children Mia, Leo, Colin and Laurent in Ölüdeniz, Turkey.
Once they came to terms with the news, the couple focused their attentions on helping their children build the skills they'd need to navigate their way through life.
When Mia's specialist suggested that they engross her with "visual memories," Lemay realized that there was one truly incredible way that they could do just that for her and the rest of the children.
"I thought, 'I'm not going to show her an elephant in a book, I'm going to take her to see a real elephant," she explains. "And I'm going to fill her visual memory with the best, most beautiful images I can."
She and her husband soon began making plans to spend a year traveling around the globe with their kids.
While Lemay and Pelletier traveled together frequently before they became parents, and had taken their children on various trips, going on an extended trip as a family hadn't seemed feasible before.
"With the diagnosis, we have an urgency," adds Pelletier, who works in finance. "There's great things to do at home, but there's nothing better than traveling.
"Not only the scenery, but also the different cultures and people."
They soon began trying to build up their savings, and their travel pot received a welcome boost when the company that Pelletier worked for and had shares in was bought.
"That was like a little gift from life," admits Lemay, who works in healthcare logistics. "Like, here's the money for your trip."
The family of six were originally due to set off in July 2020, and had planned an in-depth itinerary that involved traveling through Russia by land, and spending time in China.
The Lemay-Pelletier family explore the Quivertree Forest in Namibia, where they began their world trip.
However, they were forced to delay their trip by a number of years due to the travel restrictions brought about by the global pandemic, and revised their itinerary countless times. When they eventually left Montreal in March 2022, they had few plans in place.
"We actually left without an itinerary," says Lemay. "We had ideas of where we wanted to go, but we plan as we go. Maybe a month ahead."
Before they set off, the Lemay-Pelletier family created something of a bucket list of experiences for their travel. According to Lemay, Mia wanted to go horseback riding, while Laurent wanted to drink juice on a camel.
"It was really specific and very funny at the time," she adds.
They began their trip in Namibia, where they got up close to elephants, zebras and giraffes, before heading to Zambia and on to Tanzania, and then flying to Turkey, where they spent a month. The family then made their way to Mongolia, before moving on to Indonesia.
"We're focusing on sights," explains Pelletier. "We're also focusing a lot on fauna and flora. We've seen incredible animals in Africa, but also in Turkey and elsewhere.
"So we're really trying to make them see things that they wouldn't have seen at home and have the most incredible experiences."
Aside from witnessing beautiful sights while their vision is still relatively strong, the couple hope that the trip will help the children develop strong coping skills.
According to the National Eye Institute, part of the US National Institutes of Health, an agency of the US Department of Health and Human Services, retinitis pigmentosa symptoms usually begin in childhood, and most people eventually lose most of their sight.
"They're going to need to be really resilient throughout their life," adds Lemay, pointing out that Mia, Colin and Laurent will have to constantly readjust as their eyesight worsens.
The couple's son Leo during the family's visit to Cappadocia, Turkey.
"Traveling is something you can learn from. It's nice and fun, but it also can be really hard. You can be uncomfortable. You can be tired. There's frustration. So there's a lot that you can learn from travel itself."
While Mia, now 12, has known about her condition since she was seven, Colin and Laurent found out more recently and are beginning to ask difficult questions.
"My little one asked me, 'Mommy, what does it mean to be blind? Am I going to drive a car?'" says Lemay. "He's five. But slowly, he's understanding what's happening. It was a normal conversation for him. But for me, it was heart-wrenching."
For Leo, their second eldest child, the knowledge of his siblings genetic condition was "always a fact of life."
Lemay and Pelletier hope that getting to spend time in different countries and experience different cultures will show all of the children how fortunate they are, despite the challenges that may come later in their lives as their sight deteriorates.
"No matter how hard their life is going to be, I wanted to show them that they are lucky just to have running water in their home and to be able to go to school every day with nice colorful books," adds Lemay, who says that all four of the children have adjusted to life on the road relatively easily.
"They're super-curious," she says. "They easily adapt to new countries and new food. I'm very impressed with them."
While visual experiences remain a priority, Lemay says the trip has become more about showing the children "something different" and providing them with unforgettable experiences.
"There are beautiful places everywhere in the world, so it doesn't really matter where we go," she explains.
"And we never know what's going to impress them. We will tell ourselves [they will think] something is wonderful and then they see puppies in the street and it's the best thing in their life."
The family have been chronicling their trip via social media, posting regular updates on their Facebook and Instagram accounts.
Lemay says others who've been diagnosed themselves, or have a loved ones with retinitis pigmentosa, have gotten in touch with her to offer words of encouragement.
In fact, a teacher at a specialist school in Quebec for students who are blind or visually impaired is among their 11,000 Facebook followers and often recounts their adventures to her class.
"Every week, she opens the Facebook page and describes all the pictures or reads whatever I'm writing," says Lemay.
"And somehow they're kind of part of the trip with us. To be able to share this with other people is a really nice gift that I'm really grateful for. That makes me really happy."
Lemay and Pelletier say the trip has strengthened the bond between their four children, seen here in Mongolia.
Lemay and Pelletier admit that the diagnosis is always in the back of their minds, but they are focused on living in the moment and "putting their energy into the positive things."
"We never know when it can start or how fast it can go," adds Pelletier. "So we really want to take this time as a family and to cater to each of our kids to be able to live this experience to the fullest."
While the family plans to return home to Quebec next March, they say they're trying not to think that far ahead. In fact, the ability to live in the moment is one of the key things the family have learned over the past few months.
"This trip has opened our eyes to a lot of other things, and we really want to enjoy what we have and the people that are around us," says Pelletier.
"If that can continue when we go back, even in our daily routines, it will be a really good accomplishment."
Although traveling as a family has been testing -- the couple have also been homeschooling their children on the road -- Lemay and Pelletier say one of the highlights has been witnessing the bond between the kids strengthening.
"They're great together," he adds. "Over and above, I think it helps solidify that link between them. And hopefully that will continue in the future, so that they can support each other."
Pelletier stresses that they remain hopeful that Mia, Colin and Laurent may never go blind. But for the time being, they are doing everything they can to ensure that they can handle whatever the future may hold.
"Hopefully, science will find a solution," says Pelletier. "We cross our fingers for that. But we know that it might happen, so we want to make sure our kids are equipped to face these challenges."