done - visual development.ppt
TRANSCRIPT
![Page 1: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/1.jpg)
Visual Development
Department of Ophthalmology Medical Faculty Sriwijaya University
![Page 2: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/2.jpg)
Normal Visual Development
• Normal baby 6 weeks: should be able to maintain eye contact with other human and react with facial expression
• Infant 2-3 months: interested in bright object• Infant 4 months: disconjugate eye movement
disappear• Skew deviation and sunsetting: transient
deviation in the newborn period
![Page 3: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/3.jpg)
Poor Visual development
• Wandering eye movement• Lack of response to familiar faces and objects• Nystagmus• Staring at bright light• Forceful rubbing of the eyes (oculodigital
reflex)
![Page 4: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/4.jpg)
Refractive state
• Refractive state depend on– Corneal power• Starting 52 D at birth• Flattening 46 D by 6 months• Reaching their adult power of 42 – 44 D by age 12
– Axial length• Increases by about 4 mm in the first 6 months of life• Until 13 years growth slows only about 1 mm
– The power of lens• Decreases dramatically
![Page 5: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/5.jpg)
Visual Acuity
• Methods used to determine visual acuity in preverbal infants and toddlers:– Visual Evoke Potential (VEP)– Preferential Looking (PL)
• PL Studies estimate the vision of a new born 20/600
• Improving to 20/120 by 3 months• To 20/60 by 6 months• VEP: to 20/20 by age 6 – 7 months
![Page 6: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/6.jpg)
Stereoacuity
• Stereoacuity reaches 60 sec arc by about 5 – 6 months
![Page 7: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/7.jpg)
Refractive Errors
• Infants are hyperopic at birth• Become slightly more hyperopic until age 7• Myopic shift until age 16• Changes in refractive error very widely• If myopia presents before age 10: high risk of
eventual progression to myopia of 6 D or greater• Oblique astigmatism is common in infant and
often regresses
![Page 8: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/8.jpg)
Approach to the infant with decreased vision
• A careful history– Detail of pregnancy• Maternal infection• Radiation• Drugs• Trauma
– Perinatal problems• Prematurity• Intrauterine growth retardation• Fetal distress
![Page 9: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/9.jpg)
Approach to the infant with decreased vision
• A careful history– Perinatal problems• Meconium staining• Oxygen deprivation
• Examinations• Visual fixation• Crispness and equality of pupillary light responses• Ocular alignment and motility• Presence of nystagmus or roving eye movements• A detailed fundus examinations
![Page 10: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/10.jpg)
Approach to the infant with decreased vision
• Unresponsive to very bright light– Immature visual system
• Sluggish pupillary responses– Optic nerve hypoplasia or atrophy– Optic nerve coloboma
• Paradoxical pupillary phenomenon– Diffuse retinal disease (cones dystrophy)
• Nystagmus– Decreased vision begin at age 2-3 months not at birth
![Page 11: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/11.jpg)
Approach to the infant with decreased vision
• Nystagmus – Presence of at least some visual function
• In infant younger than 1 year– The most common misalignment: exotropia
• Beyond the age of 1 year– Esotropia is more common
• Electroretinography (ERG)– Can aid in diagnosis of a number of retinal
disorder
![Page 12: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/12.jpg)
![Page 13: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/13.jpg)
Approach to the infant with decreased vision
• Additional testing – VEP, USG, CT Scan, MRI
• Specialized laboratory studies– In some cases
• Consultation with other disciplines – Pediatric neurologist, endocrinologist,
neurosurgeon, geneticist
![Page 14: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/14.jpg)
![Page 15: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/15.jpg)
The most common causes
• Of reduced vision in infants– Anterior segment anomaly (complete ptosis,
lens/corneal opacification)– Glaucoma– Cataract– Optic nerve hypoplasia– Optic atrophy– Leber congenital amaurosis– Achromatopsia (rod monochromatism)
![Page 16: done - VISUAL DEVELOPMENT.ppt](https://reader033.vdocuments.mx/reader033/viewer/2022051211/552ba9ff550346820f8b456e/html5/thumbnails/16.jpg)
The most common causes
• Of reduced vision in infants– Congenital infection syndrome/TORCH syndrome– Cortical visual impairment– Delay in visual maturation– Retinopathy of prematurity– X link retinoschisis– Congenital motor nystagmus– Albinism– Coloboma