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Techniques of intraocular pressure determination.
1Department of Ophthalmology, Medical College of Georgia, Augusta 30912.
Lens and Eye Toxicity Research
|January 1, 1990
Summary
Accurate intraocular pressure measurement in animals requires careful tonometer selection and calibration. Different tonometers (Schiøtz, applanation) have limitations, and species-specific calibration is crucial for reliable results.
Area of Science:
- Veterinary Ophthalmology
- Ocular Physiology
Background:
- Intraocular pressure (IOP) measurement is vital in veterinary medicine.
- Various tonometers exist, including indentation and applanation types.
- Each tonometer type presents unique advantages and potential inaccuracies.
Purpose of the Study:
- To review available tonometers for animal IOP measurement.
- To highlight the limitations and proper usage of different tonometry methods.
- To emphasize the necessity of species-specific calibration for accurate IOP readings.
Main Methods:
- Review of indentation tonometers (e.g., Schiøtz).
- Discussion of applanation tonometers (e.g., air, pneumatonograph, Goldmann).
- Consideration of invasive methods like anterior chamber cannulation and associated risks.
Main Results:
- Schiøtz tonometers can yield misleading values if not used correctly.
- Applanation tonometers measure pressure by flattening a fixed corneal area.
- Anterior chamber cannulation risks disrupting the blood-aqueous barrier and altering IOP.
Conclusions:
- Tonometer selection and technique are critical for accurate IOP assessment in animals.
- Species-specific calibration is essential due to variations in ocular parameters.
- Proper calibration ensures reliable diagnostic data for animal eye care.