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Retinoschisis: Causes, Symptoms and Treatment

Retinoschisis is a splitting of the retina into two layers. It can be inherited or acquired and often leads to visual disturbances or loss of vision.

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Things worth knowing about "Retinoschisis"

Retinoschisis is a splitting of the retina into two layers. It can be inherited or acquired and often leads to visual disturbances or loss of vision.

What is Retinoschisis?

Retinoschisis (from Greek schisis = splitting) is a condition of the retina in which the retinal tissue separates into two distinct layers. Fluid accumulates between these layers, forming a blister-like elevation. Unlike a retinal detachment, the connection between the retina and the underlying choroid is usually preserved in retinoschisis, which often means a more favorable prognosis.

Causes and Types

There are two main forms of retinoschisis:

X-linked juvenile retinoschisis: This hereditary form affects almost exclusively males and is caused by mutations in the RS1 gene. It presents in childhood and is one of the most common causes of visual impairment in young boys.
Degenerative (acquired) retinoschisis: This form typically affects older adults and is associated with myopia (nearsightedness) or age-related changes in the peripheral retina. It usually begins at the outer (peripheral) edges of the retina.

Symptoms

Symptoms depend largely on the area of the retina affected:

Loss of peripheral visual field (scotomas)
Blurred or distorted central vision when the macula is involved
Flashes of light (photopsia)
In severe cases, significant vision loss due to secondary retinal detachment
In the juvenile form: difficulty reading and recognizing fine details from an early age

Diagnosis

Diagnosis is typically established by an ophthalmologist using the following methods:

Optical coherence tomography (OCT): The gold standard for imaging the retinal layers; clearly shows the characteristic splitting.
Ophthalmoscopy: Direct examination of the fundus to visualize the blister-like separation.
Electroretinography (ERG): Measurement of the electrical activity of the retina; in juvenile retinoschisis, a characteristically reduced b-wave amplitude is observed.
Genetic testing: Recommended when juvenile retinoschisis is suspected to confirm RS1 gene mutations.
Perimetry: Visual field testing to identify areas of vision loss.

Treatment

Treatment options depend on the type and severity of the condition:

Conservative Management

In mild, stable degenerative retinoschisis without macular involvement, regular monitoring by an ophthalmologist is recommended, as no immediate intervention is required.

Medical Therapy

In juvenile retinoschisis, carbonic anhydrase inhibitors (e.g., dorzolamide eye drops) have been shown to reduce cystic changes in the macula and may improve visual acuity. This approach is increasingly used in clinical practice.

Laser Treatment and Cryotherapy

In cases where tears in the outer retinal layer are detected or a secondary retinal detachment is at risk, laser photocoagulation or cryocoagulation may be used to demarcate the affected area.

Surgical Treatment

In complicated retinoschisis with secondary retinal detachment, surgical intervention such as vitrectomy (removal of the vitreous humor) or scleral buckling may be necessary.

Gene Therapy (Under Investigation)

For X-linked juvenile retinoschisis, gene therapy approaches are currently being studied in clinical trials. These involve delivering a functional copy of the RS1 gene directly into retinal cells to restore normal function.

Prognosis and Outlook

Degenerative retinoschisis generally progresses slowly and rarely threatens central vision. The juvenile form, however, can be progressive and may lead to significant visual impairment over time. Regular ophthalmologic follow-up is essential for both forms to detect and manage complications early.

References

Sikkink SK, Biswas S, Parry NR, Stanga PE, Trump D. X-linked retinoschisis: an update. Journal of Medical Genetics, 2007; 44(4):225-232. Available via PubMed.
Yanoff M, Duker JS. Ophthalmology. 5th edition. Elsevier, 2018.
National Eye Institute (NEI), National Institutes of Health (NIH). Retinoschisis. Available at: www.nei.nih.gov

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