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Childhood blindness - review CB.ppt

Definitions • Childhood: from 0 to 15 years old (UNICEF) • Blindness defined as : corrected visual acuity < 3/60 better eye


  Childhood, Visual, Childhood blindness, Blindness




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Text of Childhood blindness - review CB.ppt

Childhood blindness Overview This presentation covers the following topics: Definitions Epidemiology of childhood blindness The magnitude and prevention strategies for : Corneal blindness Childhood cataract Retinopathy of prematurity Refractive error and low vision Conclusion Notes section a more detailed explanation is provided in the notes along with key references. Definitions Childhood: from 0 to 15 years old (UNICEF) Blindness defined as : corrected visual acuity < 3/60 better eye or central visual field each eye<10 degrees Magnitude of childhood blindness . Estimated prevalence (using under-5 mortality rate as country categories): Low income countries High income countries 3/4 in poorest regions of Africa and Asia Estimated million blind children globally Estimated incidence 500,000 children /year MJC1Slide 4MJC1 Changed this to make it clearerMarissa Carter, 7/13/2011Magnitude of blindness in children per 10 million population in different regions* Affluent Middle income Poor Very poor % children in the population 20 30 40 50 Number children/10 million total population 2 million 3 million 4 million 5 million Prevalence of Childhood blindness Number blind children/10 million total population 600 1800 3600 6000 Causes of childhood blindness Poor countries: corneal scarring (vit A deficiency, measles, ophthalmia neonatorum, harmful traditional practices. Middle income countries: retinal conditions mainly hereditary, retinal dystrophies and ROP. High income countries: CNS disorders and retinal conditions. WHO classification of causes of childhood blindness Anatomical classification Aetiological classification WHO anatomical classification of causes of childhood blindness Whole globe ( ano/ micro phthalmos, Cornea ( corneal scarring, keratoconus) Lens ( cataract, aphakia) Uvea ( aniridia) Retina ( retinal dystrophies) Optic nerve ( atrophy) Glaucoma conditions where the eye appears normal ( refractive errors, cortical blindness, amblyopia). WHO aetiological classification of causes of chilhood blindness Hereditary (at conception), genetic , chromosomal abnormalities) Intrauterine (during pregnancy, rubella Perinatal ( retinopathy of prematurity, birth injury, neonatal conjunctivitis/ ophthalmia neonatorum) Childhood ( measles, trauma vitamin A ,deficiency ) unknown/cannot be determined Causes of blindness in children per 10 million population in different regions Adapted from Gogate and Gilbert. (1) No of children blind by: Affluent Middle income Poor Very poor Corneal scar 0 0 720 2000 Cataract or glaucoma 60 360 720 1000 ROP 60 450 0 0 Others 480 990 2160 3000 Avoidable causes of childhood blindness Preventable Corneal scarring due to: Vit A deficiency measles ophthalmia neonatorum traditional practices infective corneal ulcers Intrauterine factors: rubella toxoplasmosis other teratogens: alcohol Perinatal factors: ROP birth hypoxia Hereditary diseases ( consanguinous / genetic) Treatable Cataract Glaucoma ROP Uveitis Corneal disease (corneal ulcers and opacity) Magnitude and control strategies for priority causes of CHB Public health approach used to control the conditions: Primary prevention to stop the disease from occurring Secondary prevention to prevent the blindness from occurring due the disease Tertiary prevention to treat the blindness caused by the diseases where possible . Corneal blindness 70% of childhood blindness in poor countries Corneal scarring by Vit A deficiency is the single largest cause of childhood blindness Prevention requires multi-sector collaboration Corneal scar: public health approach Major causes Primary prevention Secondary prevention Tertiary prevention Vit A Vit A supplementation Nutrition education Treatment of xerophthalmia with Vit A Corneal transplantation? Not always possible / suitable Measles Measles immunization Vit A treatment for children with measles Eye examination and treatment of corneal ulcers Ophthalmia neonatorum Cleaning eyes of newborn at birth . Povidone Iodine prophylaxis Treatment with intensive antibiotics for ulcers associated with traditional practices Traditional practices Education of traditional practitioners and birth attendants. Primary eye care services Intensive, appropriate and rapid treatment of neonates with conjunctivitis Infective corneal ulcers Prompt recognition and treatment by ophthalmic personnel Other Avoid trauma Prompt recognition and treatment 1Slide 141 This is a busy chart but I think it is very clear and would be difficult to break it downCovadonga Bascaran, 8/15/2011Childhood cataract Accounts for 10-30% of childhood blindness 190,000 children blind from cataract Management of cataract in children has changed dramatically in last 20 years Timely identification and case finding are essential Childhood cataract: public health approach Main causes of childhood cataract Primary prevention Secondary prevention Tertiary prevention Congenital rubella syndrome (25%) Immunization ( not routinely available globally to date ) Early detection and surgery Surgery and close follow up Genetic (20%) Genetic counselling Early detection and surgery Surgery and close follow up * Early detection is important if surgical intervention is to have an impact . Follow up services are equally essential Retinopathy of prematurity Third epidemic of ROP in middle income countries, accounting for up to 60% of blindness. Latin America, former socialist economies of central and eastern Europe, cities in Asia 50,000 blind from ROP globally Principle risk factor ROP - unmonitored supplemental oxygen ROP public health approach Primary prevention Secondary prevention Tertiary prevention ROP Good neonatal care: -systemic steroids to mothers for premature births and -O2 monitoring of neonates Reduce preterm births: -Reduce number of implanted embryos in fertility clinics and health education about risks of in vitro and fertility drugs -Prevention of teenage pregnancies -Avoid unnecessary Caesarean sections -Screening and Examination of babies at risk -Laser treatment of type 1 ROP -Follow up -Surgery for stage 4 ROP -Low vision services and rehabilitation Refractive errors in children Responsible for 95% of visual impairment in children. million children( 5-16 yrs) visually impaired from RE, global prevalence Interferes with children s education affecting their future opportunities in life. Refractive errors in children: public health approach Primary prevention Secondary prevention Tertiary prevention Refractive errors Not possible Vision screening programs to detect cases early -Refraction and spectacles or contact lenses services -Refractive surgery -Health education on vision hygiene ( illumination, distance etc) -Low vision services and visual rehabilitation -Health education Low vision Definition: impairment of visual function even after treatment or refractive correction, and VA between 6/18 and light perception or <10 degrees from the point of fixation, but who uses or could use vision for the planning and/or execution of a task. Low vision is irreversible Global prevalence Slide 212 Covadonga Bascaran, 8/15/2011Low vision control strategies Establish the cause of visual loss Surgical interventions if appropriate Assessment of the child's various visual functions (distance vision, near vision, contrast sensitivity, and visual field) Refraction and provision of spectacles Low vision devices (magnifiers) Non-optical low vision devices (reading stands) Training in the use of devices with follow-up Conclusion Obtaining reliable data in childhood blindness is very challenging. Causes of childhood blindness are different in poor, middle and high income countries. WHO s priority areas in childhood blindness are: corneal blindness, cataract, ROP, refractive errors and low vision 28% is due to preventable causes and 15% due to treatable causes

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