paediatric cataract pathogenesis and management · foldable intra -ocular lens implantation or. 2....
TRANSCRIPT
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Paediatric cataract
pathogenesis and management
Dr. Kavitha Kalaivani. NPaediatric ophthalmologySankara Nethralaya
February 28 - 2017
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Incidence...
• 1 to 13 per 10 000 live births1
• 200,000 children blind due to bilateral cataract2
1. Lambert SR, Drack AV: Infantile cataracts. Surv Ophthalmol 1996; 40:427–458
2. World Health Organization. Global Initiative for the Elimination of Avoidable Blindness (WHO/PBL/97.61), 1997
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Adult vs. Paediatric
1. Etiology …2. Laterality …3. Age of onset… 4. Whether to operate …5. When to operate …
6. Who operates …7. IOL …8. Inflammation9. Complications10. Rehab
A child is not a small adult
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POLL - 1You are...?
1. Practising Paediatric ophthalmologist2. General ophthalmologist3. Ophthalmology resident4. Others
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Pathogenesis...
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Classification...
1. Morphological
2. Etiological
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Morphological classification...
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Morphological classification...
• Anterior –Ant.polar–Ant pyramidal–Ant subcapsular
• Posterior –Post subcapsular–Post lenticonus–Persistent fetal vasculature–Mittendorf’s dot
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Anterior cataracts
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Posterior cataracts
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Morphological classification...• Central
–Nuclear–Lamellar–Cortical riders–Sutural–Pulverulent–Ceruleun/bluedot–Acueliform /coraliform
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Central cataracts
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Etiological classification • Idiopathic • Congenital or developmental
– Idiopathic– Hereditary– Associated with TORCH, inborn errors of metabolism
• Traumatic • Part of anterior or posterior segment anomalies• Steroid induced• Complicated cataract
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Management...
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POLL - 2
How do you manage these...?
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Visually insignificant...
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Operate or not to operate…
Is this a relevant question..?When do we face this question…
– No symptoms… (?)– Bilateral symmetrical cataract– No secondary effects – nystagmus, strabismus, anisometropia– Non-progressive – early steroid induced
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Non – surgical managementIs it possible…?
• When cataract may be ONE of the reasons for the vision problem
–High anisometropia–Strabismus–Corneal opacity–Macular pathology
Dilating drops, Glasses and patching
Exotropia
-3.00 @ 150 deg
Vision – 6/24, N8
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Surgical management...
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Indications for early surgery• Total cataract• Unilateral cataract • Asymmetric cataract• Secondary effects – nystagmus, strabismus etc• Symptoms
– Vision – worse than 6/18 – Photophobia
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IOL versus No IOL...• Age of the child
–DBR surprises –Myopic shift
• Laterality of the cataract–High anisometropia–Visual rehabilitation
• Corneal diameter• Axial length
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Techniques…
1. Lens aspiration with primary posterior capsulorhexis with anterior vitrectomy and
foldable intra-ocular lens implantationOr
2. Lensectomy with vitrectomy(pars plana or limbal route)
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How to choose IOL...?
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Myopic shift
Amount of shift and
age
Target refraction
AL/K measureme
nt
IOL power formula
Factors influencing IOL power calculation
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POLL - 3
Preferred IOL formula1. SRK – II2. SRK – T3. Hoffer Q
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IOL power calculation
Any standard table – SRK II, Hoffer Q, SRK – T
SRK II: P = AI - 0.9 K - 2.5 L(1), where
– P : IOL Power for emmetropia– K : corneal refractive power (K-reading)– L : axial Length– A : A-constant
Neely DE et al. JAAPOS 2005
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Target refraction …
Age Target hyperopia 7
2 +5 D 7
Rule of 7
for above 2 years
Enyedi LB et al. AJO 1978
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Target refraction …
• < 6m : ≥ 3D to 7D• 12 m : >0 to < 3D
Wilson ME et al. JCRS 2003
• 4 - 6 wks : 8D• 6 wks – 6m : 6D
Infant aphakia study - PEDIG
Infants
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Target refraction – what we follow
• Age > 4 years
• Age 2 – 4 years
• Age < 2 years Undercorrect by 20%
Undercorrect by 10%
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Choice of IOL
• Single or multi piece PMMA• Hydrophobic acrylic single piece : in-the-bag• Hydrophobic acrylic 3 piece : in-the-sulcus• Safe to use• Optimal diameter – 10.5 – 12mm
1. Wilson ME et al. JAAPOS 2001
2. Trivedi RH et al. JCRS 2003
3. Brar GS et al. CEO 2008
4. Rowe NA et al. BJO 2001
5. Vasavada et al. - JCRS 2004; 30:1073-81.
6. Raina et al - JCRS 2004; 30:1082-91.
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Steps of surgery1. General anaesthesia2. Scleral tunnel – till alteast 4 years of age3. Anterior capsulorhexis – 6mm4. Cortical aspiration5. Posterior capsulorhexis – 4mm6. Limited anterior vitrectomy (..?)7. In-the-bag IOL placement8. Suturing of the wound – 8 years
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Steps of surgery… Wound construction
Scleral tunnel Corneal tunnel
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Steps of surgery…
• Single most crucial step– Critical for IOL placement
• Most challenging step– Highly elastic – Tendency to run– No red glow
• Capsular forceps• Capsular staining• High molecular weight visco
elastics
Anterior capsule management
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Steps of surgery … Cortical aspiration
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POLL - 4How do you manage posterior capsule...?1. Primary posterior capsulorhexis with forceps – Before IOL2. Posterior capsulotomy with vitrector – Before IOL3. Posterior capsulotomy with vitrector – After IOL4. Pupillary capture
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Steps of surgery …
• Mandatory step till 6 yrs• Rate of PCO – 100%• Atleast 4mm• Manual or with vitrector• With anterior vitrectomy
till atleast 6 yrs
Posterior capsule rhexis
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Various clinical scenarios…• Congenital/ developmental cataract• Cataract associated with other ocular anomalies• Cataract associted with systemic conditions• Traumatic cataract• Steroid induced cataract• Complicated cataract
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Traumatic cataracts…
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Other types…
Associated corneal opacity
Membranous cataract
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Uveitic cataract...
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If no primary IOL.., then..?
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Aphakia management
• Lensectomy with anterior vitrectomy
• Limbal or parsplanaapproach
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Aphakia management
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Aphakia …
Bilateral
• Aphakic glasses– Single vision - < 2 years– Bifocals - > 2 years
• Contact lenses– ? Prevents nystagmus
• Secondary lens implantation
Unilateral
• Contact lenses– RGP– Silicon extended wear
lenses– Difficult insertion
• Glasses • Secondary IOL
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So... Surgery over...
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Is it over…?• Surgery is only the first step • Appropriate glasses
– Infants – single vision glasses for near– < 2 years : single vision glasses for
1 m distance– > 2 years : bifocals
• Amblyopia management• IOP assessment life long
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What’s the latest issue...?
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Infantile vs. Paediatric
• Maximum myopic shift - < 24 months• Associated conditions – microcornea, persistant fetal
vasculature• Surgical expertise• Anaesthesia issues
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Indications for early surgery
• Unilateral cataract – 8weeks
• Asymmetric cataract
• Bilateral dense cataract – 12 weeks
• Secondary effects – nystagmus, strabismus
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POLL - 5How early you implant IOL in infants?1. < one year2. < 6 months3. < 2 months
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Primary IOL implantation...
• Corneal diameter - > 10mm
• Normal intra ocular pressure
• Absent angle anomalies
• Axial length - > 16mm
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IATS ... @ 1 year
CL group
• Visual outcome – comparable• Adverse events – 25%• Additional surgeries – 12%• Intraop complications – 11%
IOL group
• Visual outcome – comparable• Adverse events – 77%• Additional surgeries – 63%• Intraop complications – 28%
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IATS ... @ 4.5 years
CL group
• Visual outcome – comparable• Adverse events – 56%• Additional surgeries – 12%• Glaucoma – comparable
– Unger age– Smaller corneas
IOL group
• Visual outcome – comparable• Adverse events – 81%• Additional surgeries – 63%• Glaucoma – comparable
– Unger age– Smaller corneas
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So...
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Take home…1. Early surgery doesn’t translate to early IOL2. Primary IOL implantation
1. Unilateral – 6months 2. Bilateral – 8 months
3. Choice of IOL4. Steps to prevent capsule opacification5. Timely correction of residual hyperopia with near add6. Amblyopia management as long as needed7. Proper timing of secondary lens implantation
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In Unity, there is Strength