Scleral lenses and RGP lenses each offer unique benefits for vision correction. Understanding their differences can help you choose the perfect fit for your eye health.
At the heart of the scleral lens vs RGP discussion is the design. Scleral lenses are larger, typically around 15 to 16 millimeters in diameter, and are crafted to vault over the cornea without touching it. This creates a sealed fluid reservoir between the back of the lens and your corneal surface. In contrast, RGP lenses are smaller, about 8 to 9 millimeters in diameter, and are designed to rest directly on the cornea, making them more sensitive to corneal irregularities.
This design distinction is essential because it affects comfort and vision correction. Scleral lenses rest on the sturdier white part of your eye (the sclera and conjunctiva) which means they never come into contact with the sensitive corneal tissue. RGP lenses, however, rest on the cornea and require a high level of precision during the fitting process to ensure that they align well with your corneal curvature.
For many patients facing severe corneal irregularities such as keratoconus or post-surgical corneal changes, the scleral lens design is a game changer. By vaulting over the cornea, scleral lenses create a smooth optical surface that can greatly improve visual clarity and comfort, even if the shape of the underlying cornea is highly irregular.
One of the most communicated advantages of scleral lenses is the enhanced comfort they provide. Because these lenses sit on parts of the eye that are not as electrically or mechanically sensitive as the cornea, many patients experience very little to no foreign body sensation. This means that even if you are not accustomed to wearing contact lenses, many find scleral lenses a surprisingly gentle choice.
In contrast, RGP lenses, while offering a secure and stable fit when properly designed, rest directly on the corneal surface. For some individuals, this contact can initially result in a noticeable sensation or irritation, which may take time to adapt to. Our eye doctors emphasize that while the adjustment period for RGP lenses can be a bit longer, many patients eventually find them comfortable once their eyes get used to the sensation.
When comparing scleral lenses to RGPs, stability is a central factor. The larger diameter of scleral lenses means they create a dome over the entire cornea, which minimizes movement even during rapid eye movements or vigorous activities. This stability is a significant benefit, especially during sports or other physical activities. With scleral lenses, you are less likely to experience lens dislodgement or movement that can disrupt your vision.
RGP lenses, due to their smaller size, are more prone to shifting with each blink, which not only may cause a sensation of instability but can also occasionally result in the lens becoming misaligned. Such movement might allow dust or debris to collect around the lens, leading to discomfort or even potential abrasions if not promptly handled.
A unique benefit of scleral lenses lies in their ability to provide continuous moisture to the eye. Because the scleral lens vaults over the cornea, a reservoir filled with preservative-free saline creates a protective, hydrating layer. For those struggling with dry eye conditions or ocular surface diseases, this constant hydration not only relieves discomfort but also supports the overall health of the eye.
By comparison, RGP lenses rely heavily on your natural tear film for lubrication. While many patients with RGP lenses enjoy the vision correction they provide, those with severe dryness may not receive the same level of hydration, potentially leading to irritation over prolonged wear.
The protective nature of scleral lenses extends beyond hydration. The liquid reservoir acts as a shield against environmental irritants such as dust, smoke, or chemicals. This can be particularly advantageous for individuals who work in challenging environments or participate in sports where exposure to airborne debris is common. Furthermore, the fact that scleral lenses do not physically contact the cornea also minimizes the risk of mechanical damage, such as scarring or abrasion that can sometimes occur with RGP lenses.
Our eye doctors carefully assess your specific conditions and lifestyle to determine which lens type will provide the best protection and comfort for you. With scleral lenses offering improved protection for sensitive eyes, they can be a safer option for many patients, especially those with pre-existing ocular surface issues.
Contact our office today to find a top optometrist near you for personalized advice on scleral lenses and RGP lenses.
Fitting scleral lenses requires considerable precision. Because these lenses vault over the cornea, significant attention is paid to ensuring that the gap between the lens and cornea is just right. Too thin a reservoir might compromise comfort, while too thick may lead to optical aberrations. Advanced mapping techniques, such as corneal topography, are used during the fitting process to create a personalized lens that fits perfectly over your unique eye shape.
This personalized fitting is one of the reasons that scleral lenses can feel so comfortable once adapted. Every person’s eye shape is different, and the process involves carefully tailoring the lens parameters on a case-by-case basis. Although this process can be time-consuming, it is essential for ensuring maximum comfort and optimal vision correction.
For RGP lenses, the fitting process is generally more straightforward and quicker, thanks to their smaller size and the direct relationship with the corneal curvature. However, the ease of fitting does not always translate to better comfort or stability for every patient.
While the fitting process is critical for both lens types, handling and daily maintenance vary significantly. RGP lenses tend to be easier to handle due to their smaller size, making them more convenient for many wearers. Routine cleaning and disinfection of RGP lenses can be simpler, and these lenses usually require less daily care regarding replenishing hydration.
Scleral lenses, on the other hand, may demand a more involved maintenance routine. Because they create and depend on a fluid reservoir, it is important to regularly refill this reservoir with fresh saline solution. With proper training and guidance from our eye doctors, handling scleral lenses typically becomes manageable. However, extra attention is required initially to ensure that each lens is applied correctly and that cleaning routines are strictly followed to avoid any discomfort or complications.
One key consideration when evaluating scleral lens vs RGP options is cost. Scleral lenses are generally more expensive upfront due to their personalized design, the advanced fitting process, and the materials involved. Despite the higher initial cost, they can be more cost-effective over time because they are designed to last up to three years. For many patients, the enhanced comfort and visual improvement justify the investment.
Conversely, RGP lenses tend to have lower initial material costs and simpler fitting procedures, making them a more budget-friendly choice for those who do not have severe ocular surface complications. However, it is important to consider that the long-term cost of frequent replacements or additional corrective measures (like secondary glasses) might narrow this price gap.
When discussing options with our eye doctors, they will help you weigh the pros and cons based on both your clinical needs and lifestyle preferences, ensuring that you are investing in a solution that offers the best balance of cost, durability, and comfort.
Contact our office today to find a top optometrist near you for personalized advice on scleral lenses and RGP lenses.
Compare scleral lenses and RGP lenses to find the optimal solution for your vision correction needs. Discover key differences and benefits today.
