Prescribing spectacles in children - University of Nairobi...-Family history of strabismus or...
Transcript of Prescribing spectacles in children - University of Nairobi...-Family history of strabismus or...
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PEARLS FOR PRESCRIBING
SPECTACLES IN CHILDREN
Dr. Njambi Ombaba- coecsa CME-Kenya chapter
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Outline
Introduction
Visual system in children
Guidelines for spectacles for the different refractive
status
Summary
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Introduction
Children not little
adults!
Unique visual features
Most guidelines based
on clinical experience
Vs RCT
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Unique Visual Features
• Inability to determine accurately VA- rely on visual
behaviour and retinoscopy
• Cycloplegic refraction mandatory
• Lesser visual demands
• Proximal working distance (1-2 m for preschool)
• Strong accomodative power (12D in first decade)
• Plastic visual system
• Risk of amblyopia and strabismus
Donahue, Sean P.Prescribing Spectacles in Children: A Pediatric Ophthalmologist's
Approach. Optometry and Vision Science February 2007 8(2):110-114
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Prescribing for Myopia
Minimal risk for amblyopia with symmetrical myopia
Prescribing based on anticipated visual needs
Visual acuity demands of pre schoolers unlikely to > 6/12
Proximity to the visual target: Neonate (25cm); infant ( 2-3
feet) ; preschool (1-2m)
Correction :Neonates >-4D; toddlers > - 3D; pre- unit > -
1.5D
Full correction for older children
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Myopia: Full correction vs
undercorrection
No documented evidence on stimulation or retardation of
myopia progression
Studies shown no effect in over or under correction
Kushner BJ. Does overcorrecting minus lens therapy for intermittent exotropia cause myopia? Arch
Ophthalmol 1999;117:638–42.
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Astigmatism
Mild to moderate meridional astigmatism of <1.5 D, minimal effect on VA in the young child
More amblyopia with oblique astigmatism
No correction in preverbal children with symmetric
astigmatism <1.5 D unless with high hyperopia or
myopia
1.0 -1.5 D in early school-age- benefit from correction
SR for older children - give full cylinder tolerated
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Anisometropia
Very powerful amblyogenic factor, by age 3
Anisometropic amblyopia is extremely difficult to detect
Recent evidence from ATS;
Preschoolers with mild - moderate anisometropic
amblyopia ; restoration of good visual acuity and stereopsis
with spectacle correction alone
Treatment of low level recommended > 1.0D
Cotter SA, Edwards AR, Wallace DK, Beck RW, Arnold RW, Astle WF, Barnhardt CN, Birch EE, Donahue SP, Everett
DF, Felius J, Holmes JM, Kraker RT, Melia M, Repka MX, Sala NA, Silbert DI, Weise KK. Treatment of
anisometropic amblyopia in children with refractive correction. Ophthalmology 2006;113:895–903.
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Anisometropia
Challenge :
The dominant fellow eye typically has minimal refractive
error
Many children do not appreciate VA improvement- poor
compliance with glasses.
Treatment: symmetric reduction of hypermetropia of up
to 2.0 D + prescribing the full amount of cylinder unless
in accommodative esotropia (full correction of both)
Holmes JM, Clarke MP. Amblyopia. Lancet 2006;367:1343–51
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Hypermetropia
Uncorrected hypermetropia can lead to;
Accommodative esotropia
Strabismic amblyopia
Refractive amblyopia
Most young children mildly hypermetropic no correction for mild- moderate hypermetropia
Exceptions: Asthenopia.
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Hypermetropia
Threshold for treatment
Fewer than 1% of healthy children have >4 D of
hypermetropia
Significant reduction in acuity when hypermetropia
exceeds 4 D
Treatment of moderate to high hypermetropia decreases
risk of strabismus and amblyopia
Associated strabismus influences treatment threshold
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Hypermetropia
Correction >4.00 D especially if;
-Family history of strabismus or amblyopia
-Poorly controlled phoria without correction
Avoid full correction if no strabismus; blur at near hinders compliance
Symmetric reduction up to 1.5 D of spherical hypermetropia in anisometropic amblyopia
Full correction of all hypermetropia in strabismus
SR for children > 7 yrs
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Exception in prescribing for
hypermetropia
Significant developmental delay, cortical visual
impairment, severe structural ocular abnormalities, and
marked mental retardation
Not tolerate spectacles or appreciate improved VA
Down syndrome are often have low accommodative
amplitudes; need spectacles at lower thresholds
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Summary: AAO PPP Recommendations
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Thank you!