“7 Little Johnstons”' Trent Learns for 'Very First Time' About Severity of His Astigmatism: 'It's Not Good for Me' (Exclusive)

After receiving some scary results from an MRI last week, Trent Johnston continues to undergo medical tests and meets with an eye doctor in the new episode of TLC’s 7 Little Johnstons.

In a clip shared exclusively with PEOPLE ahead of the episode on Tuesday, Feb. 4, Trent, 48, meets with ophthalmologist Dr. Hinson, who after an exam, diagnoses Trent with Keratoconus, which he describes as an “irregularity on the cornea.”

“Basically there's a weakened spot in the cornea and it's causing … the front surface of his eye to be really irregular shaped,” Hinson explains as he and Trent review his test results.

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As Trent sits in the exam room with Dr. Hinson, he learns the condition’s impact has made his eyes “almost like a balloon. And if you take a balloon and kind of push on it, how it’ll pooch out in an area, that's basically what you've got there, just kind of pushing out, causing your vision to be very distorted, and it causes it to where glasses really aren't the best option for you — as far as getting you seeing the best that we can.”

Showing Trent scans of his eye, he’s explains how this “can definitely be causing distortion in your vision.”

The consultation, Trent says, is “the very first time I've had a doctor tell me about my astigmatism, and how bad it is, and that it may not be causing my vertigo or some of my eye movement problems.”

“But either way, it's not good for me. It's not good for my eyes, it's not good for my vision. And it needs to be corrected.”

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Astigmatism, the Mayo Clinic explains, is an imperfection in the curvature in the eye where the eye is “egg-shaped” and causes blurred or distorted vision.

Dr. Hinson explains to Trent — who wears glasses — that a switch to hard contact lenses would be a better option that would get him “seeing the clearest.”

“What a hard contact does, it actually sits on this area right here, and it artificially makes your eye a normal shape, like a perfectly round eyeball,” he says. If the condition continues to worsen even after using “rigid, gas permeable contact lenses,” the Mayo Clinic explains that a cornea transplant may be required.

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When told he would need the hard contact lenses, Trent admitted, “The hard contact lens, when I first hear that, I'm like, ‘Ugh.’ I don't like anybody touching my eyes or doing anything.”

“But at this point,” Trent says, holding his fists up in victory, “I'm ready to tackle it and ready to get it fixed.”

7 Little Johnstons airs Tuesdays at 9 p.m. ET on TLC.

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