Related Experiment Videos
Prevalence of ocular abnormalities in cats with hyperthyroidism
A van der Woerdt1, M E Peterson
1Department of Medicine, The Animal Medical Center, New York, NY 10021, USA. sandra.vanderwoerdt@amcny.org
Journal of Veterinary Internal Medicine
|April 20, 2000
Summary
Ocular abnormalities are common in cats, affecting approximately 75% of eyes. However, hyperthyroidism in cats is not a frequent cause of these eye conditions, with few active retinal lesions observed.
Area of Science:
- Veterinary Ophthalmology
- Endocrinology
Background:
- Hyperthyroidism is a common endocrine disorder in older cats.
- Ocular manifestations can occur in various systemic diseases.
Purpose of the Study:
- To investigate the prevalence and types of ocular abnormalities in hyperthyroid cats.
- To compare ocular findings between hyperthyroid and clinically normal euthyroid cats.
Main Methods:
- Ophthalmic examinations including slit-lamp biomicroscopy and indirect ophthalmoscopy were performed.
- One hundred hyperthyroid cats and 30 clinically normal geriatric cats were included.
- Pupil dilation was achieved using 1% tropicamide.
Main Results:
- Ocular abnormalities were prevalent in both groups, affecting about 75% of all eyes.
- Specific abnormalities like lens capsule deposits and optic nerve changes were more common in euthyroid cats.
- Active retinal lesions were rare, observed in only 3% of hyperthyroid cats.
Conclusions:
- Hyperthyroidism does not appear to be a primary or frequent cause of ocular abnormalities in cats.
- The majority of ocular changes observed were not significantly linked to hyperthyroid status.