Biometric study of the canine eye, using A-mode ultrasonography

Area of Science:

• Veterinary Ophthalmology
• Biomedical Engineering
• Ophthalmic Imaging

Background:

• Accurate intraocular measurements are crucial for diagnosing and monitoring ocular conditions in dogs.
• A-mode ultrasonography offers a non-invasive method for in vivo biometric assessment of the canine eye.

Purpose of the Study:

• To establish normative biometric data for clinically normal canine eyes using A-mode ultrasonography.
• To investigate potential sex-based differences in canine ocular dimensions.
• To determine the in vivo velocity of ultrasound through canine ocular tissues.

Main Methods:

• A-mode ultrasonography was employed on 32 eyes from 17 clinically normal dogs.
• A specialized ringstand technique with a saline bath was utilized for ultrasound application.
• Key intraocular dimensions were measured: anterior cornea to anterior lens, lens thickness, posterior lens to retina, and anterior cornea to retina.

Main Results:

• No significant difference was found in total axial length between right and left canine eyes.
• Male dogs exhibited a statistically significant increase in total axial eye length compared to female dogs (P < 0.05).
• The canine lens ultrasound velocity was determined to be 1,710 m/s, exceeding that of other species, and no adverse effects from ultrasound were observed.

Conclusions:

• A-mode ultrasonography provides reliable in vivo biometric data for canine eyes.
• Sex is a factor influencing total axial eye length in dogs, with males having longer eyes.
• The determined canine lens ultrasound velocity is a valuable parameter for ophthalmic imaging and research.