Management of adult cataract I.ppt
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Transcript of Management of adult cataract I.ppt
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Management of Adult Cataract
Prof. Naimatullah Khan Kundi
Head, Department of Ophthalmology
Khyber Teaching Hospital
Peshawar
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Management of Adult Cataract
Medical Management
Indications for surgery
Pre-operative measurements
Pre-operative evaluation and information
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Management of adult cataract Evaluation
1. Each individual’s situation may vary
2. Information and examination about the patient:
Does the lens opacity correspond to the degree of visual
impairment?
Does the patient’s reduced ability to function warrant
surgery?
Is the eye sufficiently healthy to expect improved visual
function?
Is the lens opacity 2ndry to a systemic or ocular
condition?
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Cataract Medical Management
Some approaches may be temporarily effective until
cataract progression causes additional symptoms
Refraction
Illumination and spectacle add
Pupillary dilation
Optical aids
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Cataract Medical Management
Refraction
Improvement of distant and near vision with glasses can
the functional visual impairment in many patients
Increased ambient illumination and increased spectacle add
are also helpful.
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Cataract Medical Management
Pupillary dilation
Pupillary dilation may improve visual function (axial
cataracts allowing light to pass through peripheral portions
of the lens)
Optical aids
Some patients with limited visual function from cataract
may be assisted with optical aids when surgical
management is not appropriate
Hand held monoculars (2.5x, 4x)
High add spectacles
Magnifiers
Telescopic loups for reading and close work
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Indications for Surgery
Patient’s desire
Visual requirements
Significant cataract
Monocular cataract
Complications
Diagnosis and management of other ocular diseases
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Indications for Surgery
Patient’s desire for improved visual function
Visual requirements:
Many governmental agencies and industries have
minimum standards of visual function for such tasks
as:
Driving
Flying
Operating complex equipments
A patient whose BCVA does not meet these visual
requirements may need to consider surgery
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Indications for Surgery
Significant cataract:
A patient with visually significant cataracts is a
candidate for surgery
Monocular cataract:
Common indications in these situations include:
Loss off stereopsis
peripheral vision
Bothersome glare
Symptomatic anisometropia
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Indications for Surgery
Complications:
Phacolytic glaucoma
Phacomorphic glaucoma
Phacoantigenic uveitis
Anterior dislocated lens in to AC
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Indications for Surgery
Diagnosis and management of other ocular diseases:
Dense cataract that obscures the view of the fundus
and impedes the diagnosis or management of other
ocular diseases:
Diabetic retinopathy
Retinal detachment
Glaucoma
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Pre-operative measurements
1. Refraction
2. Biometry
3. Corneal Pachymetry
4. Specular Microscopy
5. B-Scan ultrasonography
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Pre-operative measurements
Refraction
Careful refraction on both eyes
Useful in planning the IOL power necessary to obtain
the desired postoperative refraction
If fellow eye has a cataract, it may be preferable to
plan the implant power to achieve emmetropia
postoperatively
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Pre-operative measurements
Refraction (cont’d)
If fellow eye has clear lens and a high refractive
error that requires spectacles correction, obtaining
a similar refractive result in the operated eye will
avoid problems with postoperative anisometropia
Contact lens wearing in the phakic eye can avoid
the problems
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Pre-operative measurements
Biometry
Keratometry:
To determine corneal curvature and power
A-scan Ultrasonography:
To determine axial length of the eye
These are performed to calculate the appropriate
IOL implant power
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Pre-operative measurements
Corneal Pachymetry
Measurement of corneal thickness
Useful in assessing the function of corneal
endothelium
When quantitative evaluation of corneal
endothelial cell density may be limited in
patients with significant corneal guttata
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Pre-operative measurements
Corneal Pachymetry (cont’d)
Types:
1. Ultrasonic
2. Optical
Ultrasonic pachymeter more accurate and reliable
Central corneal thickness > 600µm may be
consistent with corneal edema and endothelial
dysfunction
Likelihood of postoperative clinical corneal
edema
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Pre-operative measurements
Specular Microscopy
Determine the number of corneal endothelial
cells/mm2
Normal counts > 2400 cells/mm2
Cell count < 1000 cells/mm2 abnormal
Cataract surgery causes some loss of endothelial
cells
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Pre-operative measurements
Specular Microscopy (cont’d)
If preoperative endothelial cells counts low,
risk of postoperative corneal decompensation
Endothelial cell morphology, including
enlargement and irregularity provides additional
information about the cornea to withstand stress
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Pre-operative measurements
B-scan Ultrasonography
When retinal view impossible, US of posterior segment useful
This test can help determine the preoperative status of the
posterior segment with regard to the potential for:
1. Retinal Detachment
2. Vitreous Opacities
3. Posterior Pole Tumors
4. Posterior Staphyloma
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