Date post: | 12-Apr-2017 |
Category: |
Health & Medicine |
Upload: | rajeev-raut |
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Tonopen applanation tonometer with small tip, ultrasound
verifies applanation.
Freshly enucleated goat’s eyes
Pressure checked on deep sclerectomy
drawbacks1. Dead eye with inactive
metabolism2. Test performed with eye out of
socket.3. Deep sclerectomy depth was not
uniform in all eyes .
Instrument takes many measurements and averages them.
Showing how pressure was changed
When vitreous pressure was increased anterior chamber (ac)pressure did not increase or it even dropped. But when ac
pressure was increased, vitreous pressure went up hand in hand.
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conclusions1. Anterior chamber (AC) pressure as is measured clinically today
does not corelate with vitreous pressure.AC pressure values may be low or normalbut vitreous pressure may be very high.
2. Glaucoma damage happens because of pressure effects on the nerve head, namely the vitreous pressure.
3. The findings agree with a previous french study in its findings, though pressure measurement method in the french study was different.( acta ophthalmologica , Hernandez and Bolivar2010)
4. This may explain pathogenesis of low pressure glaucoma.5. Instruments to measure vitreous pressure are
required.Surgeries /implants/drugs designed to lower anterior chamber pressure may not help a patient.