OPHTHALMOLOGY SPOTTERS - TONOMETER
6:14:00 pm
By
MD ASHFAQ AHMED
HIII FRIENDS.. TODAY'S OPHTHALMOLOGY SPOTTER OR CAN SAY INSTRUMENT IS MAINLY CONCERNED ABOUT MEASURING THE INTRAOCULAR PRESSURE i.e THE PRESSURE INSIDE YOUR EYES.. THIS IS THE FIRST THING THAT SHOULD COME INTO YOUR MIND WHEN YOU HEAR ABOUT TONOMETER/TONOMETRY...
TONOMETRY is a test to measure the pressure inside your eyes. The test is the mainstay for screening of glaucoma
WE WILL BE DEALING IT UNDER THE FOLLOWING HEADINGS :
- METHODS OF MEASURING INTRAOCULAR PRESSURE
- IMPORTANT OF THE METHODS FOR MEASURING
- METHOD OF MEASUREMENT BY SCHIOTZ TONOMETER
- CONDITIONS WITH RAISED INTRAOCULAR PRESSURE
Q - METHODS OF MEASURING INTRAOCULAR PRESSURE
A -
1. Applanation tonometry
2. Goldmann tonometry
3. Perkins tonometer
4. Dynamic contour tonometry
5. Non-contact tonometry
6. Ocular response analyzer
7. Electronic indentation tonometry
8. Rebound tonometry
9. Pneumatonometry
10. Impression tonometry (also known as indentation tonometry)
11. Non-corneal and transpalpebral tonometry
12. Palpation
13. Optical coherence tomography
Q - IMPORTANT OF THE METHODS FOR MEASURING
A - 1. APPLANATION TONOMETER : an ophthalmologic instrument used to determine pressure within the eye by measuring the force necessary to flatten an area of the cornea with a small disk
2. GOLDMANN TONOMETER : The Goldmann applanation tonometer measures the force necessary to flatten an area of the cornea of 3.06mm diameter. At this diameter, the resistance of the cornea to flattening is counterbalanced by the capillary attraction of the tear film meniscus for the tonometer head. The IOP (in mm Hg) equals the flattening force (in grams) multiplied by 10. Fluorescein dye is placed in the patient’s eye to highlight the tear film.
3. INDENTATION TONOMETRY :The principle of indentation tonometry is that a force or a weight will indent or sink into a soft eye further than into a hard eye.
Q - METHOD OF MEASUREMENT BY SCHIOTZ TONOMETER
A -
The Schiotz tonometer consists of a curved footplate which is placed
on the cornea of a supine subject. A weighted plunger attached to the
footplate sinks into the cornea in an amount that is indirectly
proportional to the pressure in the eye. The plunger will sink into the
cornea of a soft eye further than it will in a harder eye. A scale at
the top of the plunger gives a reading depending on how much the plunger
sinks into the cornea, and a conversion table converts the scale
reading into IOP measured in mm Hg.
Q - CONDITIONS WITH RAISED INTRAOCULAR PRESSURE
A -
1. Anatomical problems, i
2. Inflammation of the eye,
3. Genetic factors, increases with age and is genetically influenced
4. Side-effect from medication.
5. Glaucoma,
6. Iritis or
7. Retinal detachment.
TONOMETRY is a test to measure the pressure inside your eyes. The test is the mainstay for screening of glaucoma
WE WILL BE DEALING IT UNDER THE FOLLOWING HEADINGS :
- METHODS OF MEASURING INTRAOCULAR PRESSURE
- IMPORTANT OF THE METHODS FOR MEASURING
- METHOD OF MEASUREMENT BY SCHIOTZ TONOMETER
- CONDITIONS WITH RAISED INTRAOCULAR PRESSURE
Q - METHODS OF MEASURING INTRAOCULAR PRESSURE
A -
1. Applanation tonometry
2. Goldmann tonometry
3. Perkins tonometer
4. Dynamic contour tonometry
5. Non-contact tonometry
6. Ocular response analyzer
7. Electronic indentation tonometry
8. Rebound tonometry
9. Pneumatonometry
10. Impression tonometry (also known as indentation tonometry)
11. Non-corneal and transpalpebral tonometry
12. Palpation
13. Optical coherence tomography
Q - IMPORTANT OF THE METHODS FOR MEASURING
A - 1. APPLANATION TONOMETER : an ophthalmologic instrument used to determine pressure within the eye by measuring the force necessary to flatten an area of the cornea with a small disk
2. GOLDMANN TONOMETER : The Goldmann applanation tonometer measures the force necessary to flatten an area of the cornea of 3.06mm diameter. At this diameter, the resistance of the cornea to flattening is counterbalanced by the capillary attraction of the tear film meniscus for the tonometer head. The IOP (in mm Hg) equals the flattening force (in grams) multiplied by 10. Fluorescein dye is placed in the patient’s eye to highlight the tear film.
3. INDENTATION TONOMETRY :The principle of indentation tonometry is that a force or a weight will indent or sink into a soft eye further than into a hard eye.
Q - METHOD OF MEASUREMENT BY SCHIOTZ TONOMETER
A -
Q - CONDITIONS WITH RAISED INTRAOCULAR PRESSURE
A -
1. Anatomical problems, i
2. Inflammation of the eye,
3. Genetic factors, increases with age and is genetically influenced
4. Side-effect from medication.
5. Glaucoma,
6. Iritis or
7. Retinal detachment.
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Written by Admin
MD ASHFAQ AHMED, Final year MBBS student, BRIMS, Bidar.
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