Soft contact lenses are designed for a typical range of nearsightedness. Once your prescription moves into the high myopia range, generally beyond negative six diopters, the lens design reaches its limits. The lens may not correct your full prescription, or it may shift on your eye and cause inconsistent vision. Scleral lenses are custom made for each eye, so they can correct prescriptions that soft lenses simply cannot handle.
High myopia glasses use thick, curved lenses that distort your peripheral vision. Objects at the edges of your view look warped, and your eyes appear smaller to everyone else. Because a scleral lens sits directly on your eye, it corrects light before it reaches the cornea. That means no edge distortion and a wider, more natural field of view.
Las Vegas has some of the driest air in the country. Soft contacts lose moisture quickly in low humidity, and that leads to end of day dryness, blurry vision, and irritation. Scleral lenses hold a reservoir of saline fluid between the lens and your cornea, keeping the surface hydrated throughout the day. For patients in Spring Valley, Enterprise, and Paradise dealing with desert dryness on top of a high prescription, this built in moisture layer makes a meaningful difference.
Think of your cornea as a windshield. In high myopia, the eye is longer than normal, so light focuses in front of the retina instead of on it. A scleral lens vaults over the cornea entirely and fills the space underneath with preservative free saline. This fluid layer and the lens together create a new, smooth front surface for light to pass through. The result is precise focusing, even for very strong prescriptions.
Every scleral lens is manufactured to your specific measurements. Your eye doctor maps the shape of your cornea and the white part of your eye, called the sclera, using advanced 3D topography. This scan captures thousands of data points so the lens fits your eye like a custom mold. The optical zone of the lens is then ground to match your prescription down to fine detail, including any astigmatism that comes along with high myopia.
Unlike standard gas permeable lenses that rest on your cornea, scleral lenses land on the sclera, the tough white tissue surrounding your cornea. The center of the lens arches over the cornea without touching it. This vault design is especially important for patients with high prescriptions because it eliminates pressure on the cornea and reduces the risk of discomfort that smaller lenses can cause.
Mini scleral lenses are smaller in diameter, typically between 15 and 18 millimeters. They vault over the cornea and rest on the near edge of the sclera. For patients with high myopia who do not have additional corneal irregularity, a mini scleral lens may provide the correction they need with a slightly easier insertion and removal process.
Full scleral lenses have a larger diameter, usually 18 millimeters or more. They distribute their weight over a wider area of the sclera, which can improve stability and comfort for extended wear. Patients with very high myopia or those who also have dry eyes often prefer the full scleral design because the larger fluid reservoir provides more hydration and the lens stays centered more consistently.
For patients with high myopia plus higher order aberrations, which are subtle optical imperfections that standard lenses cannot correct, wavefront guided scleral lenses are an option. Your eye doctor uses a device called a wavefront aberrometer to measure how light travels through your entire optical system. The lens is then designed to correct not just your prescription but these finer distortions as well. This can produce noticeably sharper vision, especially at night.
Fitting a scleral lens for high myopia starts with understanding the exact shape of your eye. Advanced 3D topography captures the curves of both the cornea and the sclera in a single scan. This matters because the sclera is not perfectly round. It has ridges, flat zones, and asymmetries that vary from person to person. A detailed map lets the lens designer create a lens that follows those contours, so the edges seal properly and the lens stays comfortable.
After you put the lens on, your eye doctor uses anterior segment imaging, a type of cross sectional scan, to see how the lens sits on your eye. This scan shows the clearance between the back of the lens and the front of your cornea, measured in microns. Too much clearance and the lens feels heavy. Too little and the lens may touch the cornea after a few hours of wear. Getting this balance right is what makes a scleral lens comfortable for a full day.
A 2024 study published in the journal BMC Ophthalmology found that scleral lenses improved visual acuity from an average of 20/63 to 20/25 in patients with corneal irregularities and high refractive errors. That is a significant jump, roughly the difference between struggling to read a menu across the table and reading highway signs clearly at a distance.
High myopia is becoming more common. Research published in JAMA Ophthalmology found that the rate of high myopia in the United States nearly tripled, from 2.8 percent in the 1960s to 8.3 percent by the 2010s. As more people develop strong prescriptions, the demand for lenses that can handle these corrections continues to grow. Scleral lenses are one of the most effective tools available for this population.
Every eye is different, and outcomes depend on the severity of your myopia, the shape of your cornea, and your overall eye health. The studies above represent averages across groups of patients. Your eye doctor will evaluate your specific situation and give you realistic expectations based on your measurements and history.
Putting in a scleral lens is different from inserting a soft contact. You fill the bowl of the lens with preservative free saline, then place it on your eye using a small plunger or your fingertips. It takes a few seconds, and most patients get comfortable with the process within a week. Your eye doctor will walk you through each step during your fitting appointment and make sure you feel confident before you leave.
Most patients with high myopia wear their scleral lenses for 12 to 16 hours a day. Because the lens does not touch the cornea, it tends to be more comfortable than smaller gas permeable lenses. The fluid reservoir keeps the eye hydrated, so the dryness that comes with soft lenses in the Southwest Las Vegas desert climate is much less of a factor.
During the first week or two, you may notice some awareness of the lens edges and mild light sensitivity. This is normal. Your brain adjusts to the new optical clarity quickly, and most patients report that the lens feels natural within two weeks. Follow up visits in the first month let your eye doctor fine tune the fit based on how your eye responds.
Your first visit includes a full eye exam, detailed measurements of your cornea and sclera, and a conversation about your vision goals. Your eye doctor will assess whether your high myopia is the only factor or whether other conditions, like astigmatism or early corneal changes, need to be addressed in the lens design.
Based on your scan data, your eye doctor selects a lens design and sends the specifications to the lab. Manufacturing a custom scleral lens typically takes one to two weeks. The lens is built to match the exact shape of your eye and the full strength of your prescription.
When your lens arrives, you come in for a fitting session. Your eye doctor checks the lens on your eye using imaging to confirm clearance, comfort, and visual acuity. You then practice insertion and removal until the process feels easy. This visit usually takes about an hour.
You will return for follow up visits at one week and one month to make sure the fit remains stable. Scleral lenses are durable and typically last 12 to 18 months with proper care. Annual check ups at Insight Vision Optometry, Las Vegas ensure your prescription stays current and your lenses continue to fit well.
