A scleral shell is a thin custom cover worn over an eye that is still present but blind, shrunken, and/or disfigured, while a prosthetic eye is a fuller artificial eye worn in the socket, over an implant, after an eye has been removed. The simplest way to tell which you need: if you still have your eye, you likely need a scleral shell; if your eye has been removed, you need a prosthetic eye. Both are custom made and hand-painted by an ocularist, and neither restores vision. This guide explains the difference and who each option is for.

Facing eye disfigurement or eye loss is difficult, and the terminology can add confusion. Understanding these two devices helps you know what to expect and which path fits your situation.

What a Scleral Shell Is

A scleral shell is a thin, curved prosthesis, sometimes as thin as one millimeter, that fits over your existing eye. It is worn like a large contact lens over the entire eye that is still in place but no longer looks or functions normally, and it is hand-painted to restore a natural appearance. Because it sits over a present eye rather than filling an empty socket, a scleral shell is usually much thinner than a full prosthesis.

Scleral shells are most often used when an eye is intact but disfigured or eviscerated. According to EyeWiki from the American Academy of Ophthalmology, a scleral shell is fitted over a residual disfigured globe, such as in phthisis bulbi, atrophic bulbi, or microphthalmos. In other words, when an eye has become blind and shrunken or discolored but is still present, a shell can cover it, causing it to be more comfortable, functional, and cosmetically pleasing.

A major advantage of a scleral shell is that it often avoids surgery. For a blind but comfortable eye, a custom shell can restore appearance without removing the eye at all. Eye Concern makes custom scleral shells using the Modified Impression Method.

What a Prosthetic Eye Is

A prosthetic eye is a fuller artificial eye worn after an eye is gone. When an eye has been surgically removed, the prosthesis fills the space in the socket, fitting over the orbital implant placed during surgery and under your eyelids. As the American Academy of Ophthalmology describes, the artificial eye is fitted over the implant, custom-painted by the ocularist to match your companion eye.

A prosthetic eye follows eye removal surgery. The procedure that leads to it: enucleation, which removes the entire eyeball. The socket heals, and a custom prosthesis is fitted about six to eight weeks later.

Because it fills an empty socket, a prosthetic eye is thicker and shaped differently than a scleral shell. Both, however, are created and hand- colored by an ocularist to look like a natural eye.

The Key Differences at a Glance

The core difference is whether your eye is still present. A scleral shell fits over an existing, intact eye that is blind, disfigured, under developed or eviscerated. A prosthetic eye goes into a socket after the eye has been removed. That single distinction determines which device applies to you.

Thickness follows from that difference. A scleral shell is thin because it fits over a globe that still takes up space, while a prosthetic eye is fuller because it must replace the volume of a missing eye. Both are custom fitted from an impression and hand-painted to match your natural eye’s color, veining, and detail.

One thing both devices share is what they cannot do. Neither a scleral shell nor a prosthetic eye restores vision. As research in Cureus confirms, a scleral shell restores appearance by being worn over the affected eye, but it does not return sight. Both devices are about restoring appearance, comfort, full lid function, and confidence.

Which One Do You Need?

The right device depends on your situation. If you still have your eye but it is blind, shrunken, cloudy, or misaligned, a scleral shell is usually the answer, because it can cover the eye cosmetically without surgery. According to the American Society of Ocularists, scleral cover shells are indicated for conditions like phthisis bulbi, congenital microphthalmia, and the normal-sized blind, disfigured eye, or if you have had an evisceration.

If your eye has already been removed through enucleation, you need a prosthetic eye. The same guidance notes that patients are typically fitted for a prosthesis six to eight weeks after surgery, once the socket has healed.

Some situations are not obvious, and that is where an ocularist can help. An evaluation can determine whether your eye can be fit with a shell or whether a full prosthesis is the better path. You can read more about what an ocularist does and how they fit both devices.

What to Expect at Eye Concern

Eye Concern makes both custom scleral shells and prosthetic eyes. Our board certified ocularists build each device from an impression of your own eye or socket and hand-painted to match your natural eye. Whether you need a shell for a disfigured eye or a full prosthesis after eye loss, the same certified team can help. You can review our frequently asked questions or learn more about our practice.

If you are unsure which option fits your situation, we can help you understand it. Call Eye Concern at (480) 962-5841 to schedule a consultation and get clear guidance.

Frequently Asked Questions

What Is the Difference Between a Scleral Shell and a Prosthetic Eye?

A scleral shell is a thin prosthesis worn over an eye that is still present but blind, disfigured, under developed, or has been eviscerated, while a prosthetic eye is a fuller artificial eye worn in the socket after an eye has been removed. Both are custom made and hand-painted by an ocularist.

Do I Need Surgery for a Scleral Shell?

Usually not. A scleral shell is worn over your existing or eviscerated eye, so it often lets you restore appearance without removing the eye. An evaluation with an ocularist can confirm whether a shell is right for your situation.

Is a Scleral Shell Thinner Than a Prosthetic Eye?

Yes. A scleral shell is much thinner because it fits over an eye that is still present. A prosthetic eye is fuller because it must fill the space of a socket after the eye has been removed.

Can a Scleral Shell Restore Vision?

No. Neither a scleral shell nor a prosthetic eye restores vision. Both are designed to restore natural appearance, comfort, confidence, and some function, but not sight.

How Do I Know Which One I Need?

If you still have your eye but it is blind or disfigured, you likely need a scleral shell. If your eye has been removed and an implant placed, you need a prosthetic eye. When it is unclear, an ocularist can evaluate your eye or socket and recommend the right device.