blurring of vision: a practical approach to common case ... - dr lekha.pdf · •microspherophakia,...
TRANSCRIPT
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Blurring of Vision: A Practical Approach to Common Case Scenarios
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Cataract
• Age related
• Congenital
• Trauma
• Ocular disease
• Systemic disease
• External agents
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Systemic diseases
• Metabolic- DM, galactosemia,hypoparathyroidism
• Renal- Alport’s disease
• Cutaneous- atopic dermatitis
• Connective tissue- myotonic dystrophy, Marfan’s syndrome
• CNS- neurofibromatosis
• Down’s syndrome
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Drug induced
• Steroids
• Lovastatin
• Ergot
• Chlorpromazine
• Psoralens
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Symptoms
• Blur vision
• Glare
• Rapid change in spectacle prescription
• Decreased contrast
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Treatment
• No medications or therapy can reverse cataract formation
• Only treatment
– Surgery to remove lens
– Replace lens with artificial lens implant (called intraocular lens or IOL)
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Cataract surgery
• Remove the lens – Large incision
• Intracapsular extraction – Remove the lens/cataract in one piece
• Extracapsular extraction – Remove lens/cataract, but leave the capsule
behind
– Intraocular lens placed
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Cataract surgery
• Changing trends in cataract surgery – Procedure
• Large incision small incision (phacoemulsification)
– Artificial lens • Rigid Foldable
– Anaesthesia • General Regional (injections) Topical (eyedrops
only)
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Phacoemulsification
• Small incision <3mm • Make a small opening in
lens capsule • Use probe to break up
lens and suck lens out • Fold artificial lens and
insert through small wound into eye
• Incision seals itself and does not require suturing
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Femtosecond cataract surgery
• Easier surgery
• Improved refractive outcomes
• Lower complication rates
• Shorter phacoemulsification time
• Expensive equipment
• Needs more space
• May not be suitable for all cases
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Femtosecond cataract surgery
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Dislocated lens
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Dislocated lens
• Homocystinuria
• Marfan’s syndrome
• Weill- Marchesani’s syndrome
• Ehlers- Danlos’ syndrome
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Homocystinuria
• AR disorder of methionine metabolism
• Mental retardation, growth retardation, osteoporosis, vascular events
• In 90% of patients, the lens is dislocated or subluxed, inferiorly or inferonasally
• May cause pupillary-block glaucoma, become trapped in the anterior chamber
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Marfan’s syndrome
• AD with variable expressivity
• Skeletal, cardiovascular, ocular anomalies
• Zonular microfibrils are disrupted
• Bilateral, usually located upward and temporally
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Weill- Marchesani’s syndrome
• Short stature, brachydactyly, joint stiffness
• Microspherophakia, ectopia of the lens, severe myopia, and glaucoma
• Pupillary-block glaucoma
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Ehlers- Danlos’ syndrome
• Hyperextensibility of the skin, hypermobility of joints, tissue fragility
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Symptoms
• Extreme hyperopic or myopic shifts, atypical astigmatism or acquired aphakia.
• Vision fluctuates dramatically as the patient alternates between phakic and aphakic vision
• Monocular diplopia, due to light entering the eye via two separate focal systems
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Treatment
• Monocular diplopia - using opaque cosmetic contact lenses
• Pilocarpine therapy
• Lens dislocation into the anterior chamber causes pupillary block. In such cases, try to reposition the lens into the posterior chamber.
• Lens removal is really only indicated for patients with reduced vision or other visual or ocular symptoms.
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