Ophthalmic findings in Cohen syndrome patient without subjective ophthalmic complaints: A case report.

RATIONALE: Cohen syndrome is a rare genetic disorder that can cause various symptoms, including ophthalmic manifestations that can significantly impact a patient's visual health and quality of life.

PATIENT CONCERNS: We present the case of a 12-year-old boy diagnosed with Cohen syndrome who exhibited retinal degeneration and macular edema but could not express ophthalmic symptoms due to a developmental disability.

DIAGNOSES: The patient was diagnosed with Cohen syndrome by a heterozygous mutation in the VPS13B gene by whole exome sequencing and referred to ophthalmology for an ophthalmic examination.

INTERVENTION: Ophthalmologic tests, including visual acuity, intraocular pressure, slit lamp examination, fundus photography, and optical coherence tomography, were performed.

OUTCOMES: Visual acuity and intraocular pressure were not measured due to poor cooperation, and no abnormal findings were observed on the slit lamp examination. However, peripheral retinal degeneration was observed in the fundus examination, and cystoid macular edema was observed in both eyes on optical coherence tomography.

LESSONS: Regular ophthalmologic examination is important for patients with Cohen syndrome, especially those with developmental disabilities who may not be able to express their symptoms. Clinicians should be aware of the potential ophthalmologic manifestations of Cohen syndrome and the importance of timely diagnosis and management.