7800 SW 87 AVE SUITE B-270 MIAMI, FLORIDA 33173
305-271-8206
Contact Us
Corneal Dystrophy vs. Degeneration: What Is the Difference?
Corneal dystrophies are generally inherited disorders, or disorders caused by a new genetic change, that affect one or more layers of the cornea. They often involve both eyes. Corneal degenerations are generally acquired structural changes associated with factors such as age, inflammation, exposure, infection, trauma, systemic disease, or prior injury. These patterns help guide diagnosis, but exceptions and similar-looking conditions exist.
Either group can affect corneal clarity, shape, strength, or surface quality. Possible findings include deposits, haze, recurrent erosions, swelling, thinning, irregular shape, or scarring. Symptoms vary by diagnosis and may include fluctuating or reduced vision, glare, light sensitivity, foreign-body sensation, recurrent pain, or reduced contact lens tolerance. Some people have no symptoms when a condition is first identified.
An evaluation may include a slit-lamp examination, refraction, corneal topography or tomography, thickness measurements, endothelial assessment, and review of family, medical, surgical, and contact-lens history. Genetic testing may be useful for selected diagnoses. Sudden vision loss, increasing pain, pronounced redness, discharge, marked light sensitivity, or a new white or cloudy corneal area needs prompt professional eye care.
Types of Corneal Dystrophies
Corneal dystrophies are commonly organized by the corneal layer they primarily affect:
- Epithelial and subepithelial dystrophies, including epithelial basement membrane dystrophy, may be associated with recurrent corneal erosions, pain, and fluctuating vision.
- Stromal dystrophies, including lattice, granular, and macular dystrophies, can create deposits or haze that affect clarity and may alter the optical surface.
- Endothelial dystrophies, including Fuchs’ endothelial corneal dystrophy, may cause corneal swelling and vision that is worse at particular times of day.
The name of the dystrophy matters because natural history, monitoring, and treatment differ. Some people have mild findings, while others need medication, procedures, specialty correction, or corneal surgery. Read more about Fuchs’ corneal dystrophy and scleral lens considerations.
Related Ocular Surface and Autoimmune Conditions
Stevens-Johnson syndrome and autoimmune diseases can seriously affect the tear film, eyelids, cornea, and ocular surface, but they are not themselves corneal dystrophies. These conditions require diagnosis-specific medical care and, when appropriate, coordination with other clinicians.
Stevens-Johnson Syndrome (SJS)
Stevens-Johnson syndrome (SJS) is a rare, severe reaction that often involves the skin and mucous membranes and may cause acute and long-term eye complications. During the acute illness, eye involvement requires urgent medical management. Chronic effects may include severe dry eye, eyelid and eyelash abnormalities, scarring, corneal neovascularization, light sensitivity, and reduced vision.
A scleral device may later be considered for selected stable eyes as part of ocular surface rehabilitation, but it does not treat the systemic reaction or replace medical management. Active inflammation, infection, or an epithelial defect must be evaluated before lens wear.
Rheumatoid Arthritis (RA)
Rheumatoid arthritis is a systemic inflammatory disease that can be associated with dry eye and, less commonly, serious inflammatory corneal disease such as peripheral ulcerative keratitis. New pain, redness, light sensitivity, or reduced vision in a patient with rheumatoid arthritis requires prompt eye care.
Management focuses first on the underlying inflammation and ocular diagnosis. A scleral lens may be considered later for selected patients with persistent ocular surface exposure or irregular optics, with coordination among the appropriate clinicians.
Sjogren's Syndrome
Sjogren’s syndrome is an autoimmune disease that can significantly reduce tear production and cause chronic ocular surface inflammation. Symptoms may include burning, foreign-body sensation, light sensitivity, fluctuating vision, and difficulty tolerating conventional contact lenses.
A scleral lens fluid reservoir may support comfort and function for selected patients, but the lens does not treat the autoimmune disease and is normally used alongside appropriate dry-eye and systemic care. Read the dedicated scleral lenses for Sjogren’s syndrome guide.
Systemic Lupus Erythematosus (SLE)
Systemic lupus erythematosus (SLE) is an autoimmune disease that can affect multiple parts of the eye. Corneal and ocular surface problems may include dryness or inflammation, but eye symptoms can also arise from other structures or from treatment effects.
Care depends on the specific finding and may involve systemic treatment, local ocular therapy, monitoring, and coordination among clinicians. A scleral lens may support the ocular surface or improve irregular optics for selected stable eyes; it does not replace treatment of active inflammation.
How Dr. Edward Boshnick Evaluates Scleral Lens Candidacy
Dr. Boshnick’s role is to evaluate whether a specialty lens may safely improve vision or support the ocular surface after the underlying condition has been identified. A scleral lens does not remove corneal deposits, cure a genetic dystrophy, stop every degeneration, or replace medication, monitoring, or surgery when those are needed.
For selected eyes, the lens may create a more regular optical surface over corneal irregularity. Its fluid reservoir may also reduce exposure and friction for some forms of ocular surface disease. The fitting plan must account for corneal clearance, lens landing, oxygen transmission, tear exchange, handling ability, and the condition of the corneal endothelium.
How Scleral Lenses May Help
Scleral lenses are large-diameter, oxygen-permeable rigid lenses that rest on the sclera and vault the cornea. They are filled with sterile, preservative-free saline before insertion. For selected corneal dystrophies or degenerations, this design may improve vision when irregular corneal shape limits glasses or standard contact lenses.
Read the focused scleral lenses for corneal dystrophy and degeneration guide or learn about special fitting considerations for Fuchs’ corneal dystrophy.
Protecting a Fragile Corneal Surface
For some patients, a properly fitted scleral lens can reduce direct interaction between the eyelid and a fragile or irregular corneal surface. Whether that is appropriate depends on the diagnosis, epithelial integrity, tear reservoir, lens fit, wear time, and ongoing eye-health findings.
Supporting the Ocular Surface
The fluid reservoir beneath a scleral lens keeps preservative-free saline against the corneal surface during wear. This may improve comfort and reduce exposure for selected patients, but it should not be described as a cure or assumed to heal an ulcer or erosion. Active inflammation, infection, epithelial defects, or other disease requires medical evaluation and may temporarily make lens wear inappropriate.
Patients whose disease is related to Sjögren’s syndrome, Stevens-Johnson syndrome, graft-versus-host disease, or neurotrophic keratitis can review the Sjögren’s and ocular surface disease guide and the severe ocular surface conditions guide.
Improving Vision Through Irregular Corneal Optics
By placing a regular rigid optical surface in front of an irregular cornea, a scleral lens may reduce blur, ghosting, or distortion that glasses cannot fully correct. The amount of improvement varies with the location and depth of corneal opacity, retinal and optic nerve health, residual higher-order aberrations, and the final lens fit and optics.
Dr. Boshnick uses corneal measurements, diagnostic lenses, over-refraction, and follow-up examinations to refine the design. Continuing review is important because corneal health and lens fit can change over time.
Medical sources
- National Eye Institute: Corneal dystrophies
- NCBI Bookshelf: Corneal dystrophy and degeneration
- IC3D classification of corneal dystrophies, third edition
- Peer-reviewed review of scleral lens indications and complications
This information is educational. Diagnosis and treatment must be based on an individual eye examination.
Frequently Asked Questions
Corneal dystrophies are usually inherited or caused by a new genetic change and often affect specific corneal layers in both eyes. Corneal degenerations are generally acquired changes associated with age, inflammation, exposure, infection, trauma, systemic disease, or prior injury. Exceptions and look-alike findings exist, so an eye examination and medical history are needed for diagnosis.
Usually, no. Corneal dystrophies are generally genetic disorders of the cornea, not autoimmune diseases. Autoimmune conditions such as Sjogren’s syndrome, rheumatoid arthritis, and lupus can separately affect the tear film, ocular surface, or cornea. A person may have more than one condition, so the cause of a corneal finding must be established through an examination.
No. Scleral lenses do not remove deposits, change inherited biology, or stop every dystrophy from progressing. They may improve vision over an irregular cornea or support the ocular surface for selected patients while diagnosis-specific monitoring and treatment continue.
The rigid front surface of a scleral lens can create more regular optics over an irregular cornea. Improvement varies with the type and location of corneal changes, opacity, retinal and optic nerve health, residual aberrations, and the final lens fit.
For selected patients, the fluid reservoir and corneal vault may reduce exposure and eyelid friction during wear. Active infection, inflammation, epithelial defects, or other disease still requires medical care and may make lens wear temporarily inappropriate.
No. Candidacy depends on the diagnosis, corneal and endothelial health, oxygen needs, expected optical benefit, handling ability, and follow-up findings. Some patients need another form of correction, medical treatment, surgery, or coordinated care.
Yes. They require daily cleaning and disinfection, fresh sterile preservative-free filling solution, correct insertion and removal, and replacement of the lens and care products as directed. Water should not be used to fill or rinse a lens unless a clinician specifically directs otherwise.
Follow-up allows the clinician to evaluate corneal clearance after settling, lens landing, surface wettability, vision, comfort, wear time, and eye health. The design or wearing plan may need to change if the cornea or condition changes.
Schedule Your Consultation with
Dr. Boshnick
-
-
-
7800 Sw 87 Ave Suite B-270
Miami, Florida 33173
