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What Is Microspherophakia?

Microspherophakia is a congenital lens anomaly in which the crystalline lens is abnormally small in diameter and more spherical than usual. The increased curvature gives the lens high refractive power and can cause significant lenticular myopia. Because the lens is small and rounded, zonular support is often weak, making it prone to subluxation or dislocation. The bulky lens can also crowd the anterior chamber and contribute to pupillary block and angle closure glaucoma. Microspherophakia may occur in isolation or as part of systemic syndromes.

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What Is Microspherophakia?

Microspherophakia is a congenital lens anomaly in which the crystalline lens is abnormally small in diameter and more spherical than usual. The increased curvature gives the lens high refractive power and can cause significant lenticular myopia. Because the lens is small and rounded, zonular support is often weak, making it prone to subluxation or dislocation. The bulky lens can also crowd the anterior chamber and contribute to pupillary block and angle closure glaucoma. Microspherophakia may occur in isolation or as part of systemic syndromes.

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Anatomy, Causes, and Associations

In microspherophakia, the equatorial diameter of the lens is reduced while thickness and curvature are increased. Abnormal development of the lens and zonules is thought to underlie the change. The condition is associated with syndromes such as Weill Marchesani, homocystinuria, and some connective tissue disorders, but sporadic cases also exist. Shallow anterior chambers, steep lenses, and narrow angles are common anatomic features. Zonular laxity predisposes to lens instability and pupillary block.

Clinical Features and Visual Impact

Children and young adults with microspherophakia often present with high myopia, blurred distance vision, and sometimes fluctuating acuity. On slit lamp exam, the lens appears small and more spherical, and in some cases its equator is visible through a dilated pupil. The anterior chamber is shallow, and the angles are narrow on gonioscopy. Subluxation or dislocation can cause irregular astigmatism, monocular diplopia, or sudden changes in vision. Elevated intraocular pressure or acute angle closure may be the first manifestation in some patients.

How Is Microspherophakia Diagnosed?

Diagnosis combines clinical examination with imaging. Slit lamp biomicroscopy reveals the small, spherical lens and shallow anterior chamber. Gonioscopy assesses angle configuration and synechiae. Ultrasound biomicroscopy or anterior segment optical coherence tomography can quantify lens position and anterior chamber depth. Refraction documents high lenticular myopia or astigmatism. Systemic evaluation and genetic consultation are considered when features suggest an underlying syndrome.

How Is Microspherophakia Managed?

Management aims to correct refractive error and prevent or treat glaucoma and lens related complications. Glasses or contact lenses address myopia, but surgical intervention may be needed when pupillary block or lens subluxation threatens vision. Options include peripheral iridotomy, lens extraction with or without intraocular lens implantation, and, when glaucoma is advanced, additional glaucoma surgery. Because anatomy is complex, procedures are planned carefully by experienced surgeons. Lifelong monitoring tracks intraocular pressure, optic nerve status, and lens stability.

FAQs About Microspherophakia

Is microspherophakia always part of a syndrome?

No, it can occur as an isolated ocular finding, but it is also seen in systemic conditions like Weill Marchesani syndrome. A thorough medical evaluation helps clarify this.

Why does microspherophakia increase glaucoma risk?

The small, spherical lens crowds the anterior chamber and can block aqueous flow through the pupil, leading to pupillary block and angle closure.

Can microspherophakia be treated without surgery?

Refractive error can often be managed with glasses or contacts, and laser iridotomy can relieve pupillary block in some cases. Surgery is considered when lens position or glaucoma cannot be controlled otherwise.

Will microspherophakia worsen over time?

The basic lens shape is congenital and stable, but complications like subluxation and glaucoma can develop or progress. Regular eye exams help detect problems while they are still manageable.

References

EyeWiki. “Microspherophakia.” https://eyewiki.org/Microspherophakia?455546192629749†L75-L113?

StatPearls. “Microspherophakia.” https://www.ncbi.nlm.nih.gov/books/NBK558985/?317574967154151†L101-L146?

Hereditary Ocular Disease Project. “Spherophakia.” http://disorders.eyesearchfoundation.org/spherophakia?653060141717815†L29-L64?

MDSearchlight. “Microspherophakia.” https://mdsearchlight.com/microspherophakia?646651173228514†L76-L91?

AAO EyeNet. “Microspherophakia and Associated Syndromes.” https://www.aao.org/eyenet/article/microspherophakia?206624950611839†L66-L126?

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