Cindy Niangsuanbawi, B. Optom
Optometry Intern, Dr. Shroff’s Charity Eye Hospital, New Delhi, India
A well-developed normal crystalline lens is transparent which focuses the light entering the eye onto the retina. Cataract means opacity of the transparent lens, which can cause a decrease in vision and may lead to blindness if left untreated. You might have noticed the eyes of your grandparents becoming cloudy as they become older and may complain of diminution of vision. This is due to degenerative changes of the already-formed normal lens.
As we go through the ageing process in life, our lens also ages with time. We can say that cataract is very common in middle aged and old people. But a new-born baby child can also develop cataracts due to some disturbances in the development of the crystalline lens. When the disturbance occurs before birth, it is called congenital cataract and developmental cataract may occur from infancy to adolescence.
Listed below are a few of the aetiologies of congenital and developmental cataract.
- Idiopathic: Any unknown cause.
- Heredity: It can be inherited with or without systemic diseases. The most common with systemic diseases is Down syndrome,(1) Lowe syndrome, Norrie syndrome, Cerebrovasculo-facial syndrome, and Stickler Syndrome.(2)
- Maternal factors: The mother may have history of illness, infection (like rubella, toxoplasmosis etc), drugs ingestion (corticosteroids, thalidomide) and maternal exposure to radiation can also cause congenital cataract. (3)
- Foetal/infantile: Deficiency of oxygen owing to placental haemorrhage, birth trauma, metabolic disorders, malnutrition in early infancy, and some are associated to other ocular abnormalities such as microphthalmos, aniridia or microcornea. (4)
- Trauma (Birth trauma): Any history of trauma can also cause cataract in infants.
Table 1: Morphological classification of congenital and developmental cataract according to the effects on vision.(3-8)
|Visually significant congenital cataract||Visually insignificant Congenital cataract|
Congenital Membranous cataract :Due to total or partial absorption of congenital cataract, only thin
|Sutural cataract:(punctate opacities in various shapes around the y sutures)
Regardless of the aetiology, early diagnosis in congenital cataracts is the key to reach good visual function. Late diagnosis and treatment may lead to irreversible deprivation of vision, amblyopic eye, severe visual impairment, or blindness. Prompt treatment and management of a visually significant cataract is necessary to allow proper development of the lens.
Spreading awareness among pregnant women in the community, prenatal imaging diagnosis by ultrasound and regular eye screening in children is needed for early detection. Prompt management and treatment can have a tremendous impact on the life of a child with cataract and their families.
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- Benso C, Belahda K, Denis D. Fakehoury O, Aziz A, Matonti F, Epidemiologic and etiology characteristic of congenital cataract.