Congenital cataract, defined as opacification of the lens, is a significant eye disease that may result in childhood blindness if not treated early and promptly [1]. The leading cause of this condition is a genetic mutation which accounts for 25% of cases and is transmitted in an autosomal dominant pattern [2]. Congenital cataract can appear as part of trisomies 21 and 18 or metabolic disorders such as galactosemia, Wilson's disease, hypocalcemia, etc [2] [3]. This eye disease may also develop as a result of a congenital infection syndrome. Diseases such toxoplasmosis, rubella, cytomegalovirus (CMV), and herpes simplex infections (known as the TORCH) could cause damage to the eyes, brain, limbs, and possible death [4] [5]. Other intrauterine infectious causes include Treponema pallidum and varicella zoster virus (VZV) [5]. It is of utmost importance to detect this disease at birth in order to ensure prompt referral to ophthalmology and adequate treatment for prevention of blindness.

The clinical presentation in neonates includes the absence of a red reflex [2]. Additionally, these infants exhibit nystagmus, unawareness of their surroundings and fail to fix and follow [2]. Note that cataract may affect one or both eyes.

Infants with metabolic or systemic disorders will likely present with other clinical features such as renal and cardiac diseases, deafness, mental retardation, and so forth.

Physical exam

Screening for congenital cataracts is performed easily with the red reflex examination, which is highly recommended for all newborns [6] [7]. This test also assesses for other ocular pathologies as well [8].

During the newborn ocular screen, white reflex (also called leukocoria) is indicative of cataracts [9]. This is followed by further types of examination such as the slit lamp and dilated fundus.

Exam findings in patients with metabolic or systemic diseases will reflect related clinical syndromes.

Neonates exhibiting an abnormal red reflex warrant a prompt workup and consultation with an ophthalmologist. During the assessment, the medical team should elicit the maternal history which includes diet, exposure to pets, lifestyle, and living environment [10]. Also very important is a thorough newborn physical exam including a hearing test. Moreover, the evaluation will include pertinent studies.

Laboratory tests

Infectious causes should be investigated with TORCH titers and the Venereal Disease Research Laboratory (VDRL) test. Additionally, the workup may include a complete blood count (CBC) and urine studies measuring calcium, amino acids, phosphorous, etc.

Finally, another component of the workup includes genetic testing [11].

Imaging

Brain computed tomography (CT) may also be indicated.

Treatment for congenital cataract typically involves surgical removal of the cloudy lens. The timing of surgery is crucial and depends on the severity of the cataract and its impact on vision. Post-surgery, vision correction is necessary, which may include:

• Intraocular lens (IOL) implantation: A synthetic lens is placed in the eye.
• Contact lenses or glasses: To correct vision if an IOL is not suitable.
• Amblyopia therapy: To improve vision in the weaker eye, often involving patching the stronger eye.

Congenital cataracts can result from various causes, including:

• Genetic factors: Mutations in specific genes can lead to cataract formation.
• Infections during pregnancy: Such as rubella, toxoplasmosis, or cytomegalovirus.
• Metabolic disorders: Conditions like galactosemia can cause cataracts.
• Syndromic associations: Cataracts can be part of broader syndromes like Down syndrome.

Congenital cataracts are relatively rare, occurring in approximately 1 to 6 per 10,000 live births. The incidence can vary based on geographic and ethnic factors. Early detection through newborn screening programs has improved outcomes significantly.

The pathophysiology of congenital cataract involves the disruption of normal lens development. This can occur due to genetic mutations affecting lens proteins, metabolic imbalances, or environmental factors during pregnancy. The result is an opaque lens that impairs light transmission to the retina.

Preventing congenital cataracts involves addressing modifiable risk factors:

• Prenatal care: Ensuring maternal health and vaccination against infections like rubella.
• Genetic counseling: For families with a history of congenital cataracts or related conditions.
• Newborn screening: Early detection and intervention can prevent long-term visual impairment.

Congenital cataract is a condition characterized by lens opacity present at birth, leading to potential vision impairment. Early diagnosis and treatment are crucial for optimal visual outcomes. The condition can arise from genetic, infectious, or metabolic causes, and its management often involves surgical intervention and vision correction.

For parents and caregivers, understanding congenital cataract is essential. If you notice any unusual eye appearance or behavior in your child, such as a white reflection in the pupil or poor eye tracking, seek an eye examination promptly. Early treatment can significantly improve your child's vision and quality of life. Regular follow-ups with an eye specialist are important to monitor and manage your child's visual development.

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