Lisch corneal dystrophy (LCD, also recently called Lisch epithelial corneal dystrophy: LECD) is a rare superficial corneal dystrophy characterized by gray, whorled or feathery microcysts in the corneal epithelium. It was first reported in 1992 by Lisch et al. in the American Journal of Ophthalmology as a new corneal epithelial dystrophy in five members of a German family1).
Changes in classification according to IC3D:
Inheritance pattern: Traditionally considered X-linked dominant inheritance, linkage to Xp22.3 was demonstrated in a 2000 family study by Lisch et al. with a LOD score of 4.59 (θ=0)2). The absence of male-to-male transmission also supports X-linked inheritance. In a large 2024 study by Patterson et al., the causative gene was identified as MCOLN1 (encoding mucolipin-1), and heterozygous loss-of-function mutations cause the disease3). MCOLN1 is normally located at 19p13.2, but it is debated whether it acts through a pseudogene, pseudoautosomal region, or another regulatory mechanism at the linked region (Xp22.3). Notably, biallelic (homozygous or compound heterozygous) mutations in MCOLN1 cause a different disease, mucolipidosis type IV (MLIV)3).
The onset of LCD is thought to occur in childhood, but most reported cases are in adults. The lesions progress slowly and do not become clinically apparent until adulthood in many patients. Age at presentation ranges from the 20s to the 70s. In the report by Patterson et al., heterozygous rare variants in MCOLN1 were identified in 23 of 27 patients (approximately 85%) diagnosed with LECD3).
The main complaint is painless progressive blurred vision that cannot be corrected with glasses1). Monocular diplopia has also been reported. If the lesions do not involve the visual axis, patients may be asymptomatic and discovered incidentally. Corneal epithelial erosions are usually absent, and the condition is not accompanied by eye pain, which is a key clinical distinction from Meesmann corneal dystrophy1,2).
Slit-Lamp Microscopy Findings
Gray microcysts: Band-shaped or club-shaped intraepithelial corneal lesions are observed.
Whorled pattern: Lesions may be arranged in a whorl-like pattern.
Feathery pattern: May present a fluffy, feather-like appearance.
Staining: Not stained with fluorescein or rose bengal.
Special Examination Findings
Retroillumination: Dense clusters of transparent intraepithelial microcysts are clearly observed.
Anterior segment optical coherence tomography (OCT): Corneal thickness is normal, with no involvement of the stroma, and hyperreflective lesions in the epithelium are observed.
Confocal microscopy: According to a report by Kurbanyan et al., affected epithelial cells show hyperreflectivity in the perinuclear cytoplasm and hyporeflectivity in the nucleus, and involvement of the limbal region was also confirmed9).
Corneal topography: May show normal findings
Unilateral onset is reported to be more common, but bilateral involvement can also occur. Even if both eyes have lesions, if only one eye’s visual axis is involved, only unilateral visual impairment may be present.
Causative gene (identified in 2024):
Inheritance pattern:
Risk factors:
No consistent systemic complications have been observed, and no physical factors suggesting a mechanical mechanism have been identified. There is evidence suggesting that the abnormal cells causing epithelial defects originate from the limbus 9).
The diagnosis of LCD is based on a combination of characteristic slit-lamp microscopy findings and histopathological findings.
Key diagnostic points:
Ancillary tests:
Differential diagnosis:
| Differential disease | Key points for differentiation |
|---|---|
| Meesmann corneal dystrophy | Autosomal dominant, symmetric diffuse, with eye pain |
| Fabry disease | Always bilateral symmetric, vortex keratopathy |
| Contact lens-induced epithelial defect | Improves with discontinuation of contact lens |
Differentiation from Meesmann corneal dystrophy is most important. Meesmann is an autosomal dominant disorder caused by mutations in the KRT3/KRT12 genes, and the lesions are bilateral, symmetric, and diffuse. LCD presents with asymmetric, dense lesions and usually does not involve eye pain, which helps in differentiation 1,2). Lisch et al. (2000) established through linkage analysis that Meesmann (KRT12/KRT3 at 17q12 and 12q13) and LCD (Xp22.3) are genetically distinct diseases 2).
Meesmann corneal dystrophy is autosomal dominant (KRT3/KRT12 gene mutations), whereas LCD is X-linked dominant (Xp22.3). Meesmann lesions are bilateral, symmetric, and diffuse, while LCD presents with asymmetric, dense clusters. Additionally, Meesmann frequently involves eye pain due to corneal epithelial erosions, but LCD usually does not involve eye pain.
LCD is extremely rare, and all treatments are based on case reports.
Conservative treatment
Contact lenses: The use of hard and soft contact lenses has been reported to reduce lesions and improve visual acuity 1). However, lesions may worsen upon discontinuation.
Observation: If the lesion does not involve the visual axis or visual impairment is mild, observation is recommended.
Surgical Treatment
Epithelial debridement: A minimally invasive first-line option. Lesion resolution can be achieved for at least 6 months, but recurrence rates are high.
Epithelial removal + limbal cautery: Tuteja & Lockington (2025) reported a definitive treatment combining staged corneal epithelial removal with targeted limited limbal resection and cautery 7).
PRK + mitomycin C: Wessel et al. (2011) reported good results with PRK and adjunctive mitomycin C 0.02%. Suitable for patients who also desire refractive correction 6).
Topical 5-fluorouracil (5-FU): Amer et al. (2023) reported lesion regression with topical 5-FU in recurrent cases 8).
Autologous limbal transplantation: Indicated for cases resistant to other treatments. Successful prevention of recurrence has been reported 5).
Stepwise approach to treatment selection:
Multiple cases have reported a reduction in lesions and improvement in visual acuity with the use of hard and soft contact lenses. However, discontinuing contact lens use leads to worsening of the lesions again, so it is not a fundamental treatment. There have also been reports of LCD developing in patients who use contact lenses daily, indicating that the protective effect is not complete.
Recurrence is considered relatively common with epithelial debridement. Combined epithelial removal and limbal cautery has been reported to have no recurrence for two years, and autologous limbal transplantation has also been reported to successfully prevent recurrence, but these are based on a small number of cases. There is still insufficient data on long-term recurrence prevention, and regular follow-up is important.
The essence of LCD pathology is extensive cytoplasmic vacuolization of corneal epithelial cells.
Histopathological findings:
Electron microscopy findings:
Relationship with the limbus:
MCOLN1 haploinsufficiency and vacuole formation: Mucolipin-1 encoded by MCOLN1 is a lysosomal membrane cation channel (TRPML1) involved in lysosomal function, autophagy, and endosomal trafficking. In LECD, haploinsufficiency due to heterozygous loss-of-function is presumed to cause partial lysosomal dysfunction and vacuolization in corneal epithelial cells 3). On the other hand, biallelic mutations result in a more severe systemic phenotype, MLIV, suggesting a dose-dependent molecular pathology 3).
Since its first description in 1992, research on LCD/LECD has been limited due to the small number of cases, but significant progress has been made in the 2020s.
Identification of the causative gene (2024): Patterson et al. identified heterozygous loss-of-function mutations in MCOLN1 as the main cause of LECD through whole-exome and whole-genome analyses of a multicenter, multinational cohort (27 cases / 17 families) 3). Consequently, in IC3D Edition 3 (2024), this condition was reclassified as Category 1 (known gene/protein) 4).
Advances in treatment:
Future challenges:
Lisch W, Steuhl KP, Lisch C, Weidle EG, Emmig CT, Cohen KL, Perry HD. A new, band-shaped and whorled microcystic dystrophy of the corneal epithelium. Am J Ophthalmol. 1992;114(1):35-44. PMID: 1621784.
Lisch W, Büttner A, Oeffner F, Böddeker I, Engel H, Lisch C, Ziegler A, Grzeschik KH. Lisch corneal dystrophy is genetically distinct from Meesmann corneal dystrophy and maps to xp22.3. Am J Ophthalmol. 2000;130(4):461-468. PMID: 11024418.
Patterson K, Chong JX, Chung DD, Lisch W, Karp CL, Dreisler E, Lockington D, Rohrbach JM, Garczarczyk-Asim D, Müller T, Tuft SJ, Skalicka P, Wilnai Y, Samra NN, Ibrahim A, Mandel H, Davidson AE, Liskova P, Aldave AJ, Bamshad MJ, Janecke AR. Lisch Epithelial Corneal Dystrophy Is Caused by Heterozygous Loss-of-Function Variants in MCOLN1. Am J Ophthalmol. 2024;258:183-195. PMID: 37972748.
Weiss JS, Rapuano CJ, Seitz B, Busin M, Kivelä TT, et al. IC3D Classification of Corneal Dystrophies—Edition 3. Cornea. 2024;43(4):466-527. PMID: 38359414.
Alvarez-Fischer M, Alvarez de Toledo J, Barraquer RI. Lisch corneal dystrophy. Cornea. 2005;24(4):494-495. PMID: 15829814.
Wessel MM, Sarkar JS, Jakobiec FA, Dang N, Bhat P, Michaud N, Starr CE. Treatment of Lisch corneal dystrophy with photorefractive keratectomy and mitomycin C. Cornea. 2011;30(4):481-485. PMID: 21045666.
Tuteja SY, Lockington D. Definitive Treatment of Lisch Epithelial Corneal Dystrophy via Staged Keratectomy and Targeted Minor Limbal Excision With Cautery. Cornea. 2025;44(3):383-386. PMID: 39774538.
Amer MM, Arze K, Galor A, Sayegh Y, Dubovy SS, Karp CL. Recurrent Lisch Epithelial Corneal Dystrophy Treated With 5-Fluorouracil: A Case Report and Review of the Literature. Cornea. 2023;42(5):645-647. PMID: 36533990.
Kurbanyan K, Sejpal KD, Aldave AJ, Deng SX. In vivo confocal microscopic findings in Lisch corneal dystrophy. Cornea. 2012;31(4):437-441. PMID: 22222997.
