Movie with teenage alien girl living on Earth

I'm pretty sure it is a TV series, "The Girl From Tomorrow", but yes it was shown on Nickelodeon like other non-American made TV series such as "The Tomorrow People" (the 90's version (not the recent remake or the 70's version)), where Nickelodeon had a tendency to show them when they didn't have enough US-made content.

The Girl from Tomorrow is an Australian children's television series created by Film Australia. The series is based around Alana (Katharine Cullen), a girl from the year 3000. At the start of the series, she is kidnapped by Silverthorn, a criminal from the year 2500, and brought back in time to the year 1990.

While in the year 1990, she befriends Jenny (Melissa Marshall), who helps Alana adapt to life in a time unfamiliar to her, and later helps her to return to her own time.

A sequel series, The Girl from Tomorrow Part II: Tomorrow's End aired in 1991.

I distinctly remember the scene you are referring to and it is something that stuck with me as well. The scene is from when Jenny (and her Mother) take Alana to enroll her in Jenny's school and Jenny's Mum literally runs into the science teacher who has a box of eyes for a class experiment - episode 4, about 4 minutes in. You can watch the entire series (or at least most of it) on YouTube.

"This creature was blind"
"Why do you say that?"
"It has a cataract"

I have been researching a similar movie and could never recall the movie name except that somewhere on the title, it said "Sapian". Come to find out it's called Hyper Sapian released in 1986 which thought I recalled it to be a 90’s release. Great childhood movie.

One night, three aliens from the planet Taros — a young woman named Robyn, a girl named Tavy, and a furry three-eyed, three-armed creature named Kirbi — stow away on a spaceship headed for Earth, and land near Aladdin, Wyoming. The next morning, the aliens befriend a rancher's son named Dirt while he's out riding fences on his motorcycle. Robyn shows off her bike-riding skills, and the quartet go to visit Dirt's grandparents. After Kirbi beats Grandpa at poker, the creature drinks a can of gasoline. Later, Kirbi keeps feeding the goats even though Grandpa wants him to feed the chickens. Grandpa then shows Kirbi how to shoot Coors cans with a gun while he complains about how much the world has changed. Dirt forms a relationship with Robyn, learning that her hair changes color depending on exposure to sunlight and that she's come from a moonbase and was supposed to go back to her home planet, rather than coming to Earth. Dirt tries to keep his new friends a secret from the rest of his family, but things get complicated when other aliens come looking for the missing trio, Grandpa shows Kirbi to some old folks at the General Store, and a Senator arrives at the ranch for a barbecue.