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Ultrasound (Ocular Ultrasonography)

Fluorescein Strip Electroretinograph (ERG) Ultrasound (Ocular Ultrasonography) Veterinary Tonometer Ocular Speculum Nasolacrimal Duct Probe Fundus Camera Cryotherapy Veterinary Retinoscope Veterinary Ophthalmoscope Microkeratome (Keratotome) in Veterinary Medicine Eye Image Analysis Device

Ocular ultrasonography in veterinary medicine is a precise and non-invasive method used to evaluate the internal structures of the eye and the surrounding tissues. This technique allows veterinarians to obtain valuable information about the health of an animal’s eye without surgery or direct contact with delicate intraocular tissues. In many animals especially when the cornea or lens is cloudy or inflamed and direct visualization with an ophthalmoscope is not possible ocular ultrasound becomes the best diagnostic tool. It helps identify hidden lesions, tumors, foreign bodies, or intraocular hemorrhage.

The basic principle of this device is the emission and reflection of high-frequency sound waves (typically between 7.5 and 20 MHz). The sound waves are transmitted into the eye through a transducer (probe) and are partially reflected depending on the density of the tissues. The device receives these echoes and displays them on the monitor as a two-dimensional image or an acoustic signal. Since different ocular tissues such as the cornea, vitreous body, retina, and lens have different densities, each produces a distinct ultrasonographic appearance. Accurate interpretation of these images helps the veterinarian diagnose a wide range of structural ocular abnormalities.

Clinical Applications in Veterinary Medicine:

 

  • Diagnosis of retinal detachment
  • Detection of intraocular masses or tumors
  • Diagnosis of vitreous hemorrhage
  • Identification of foreign bodies inside the globe or orbit
  • Evaluation of lens abnormalities (cataract, lens luxation)
  • Examination of the optic nerve and its structures
  • Assistance in planning ocular surgeries
  • Evaluation of the posterior segment of the eye in cases of orbital swelling or abscess

Advantages:

  • Completely non-invasive and painless
  • Effective even when the cornea or lens is opaque
  • Helps in early detection of ocular lesions
  • Suitable for monitoring after treatment or surgery

Procedure of Ocular Ultrasound:

 

  1. The animal is examined without general anesthesia, though mild sedation or topical anesthesia may be used.
  2. The area around the eye is cleaned, and the eyelids are kept open if necessary.
  3. Ultrasound gel or sterile normal saline is applied as a coupling medium to ensure proper sound transmission.
  4. The probe is gently placed either on the closed eyelid or directly on the cornea (under sterile conditions).
  5. Real-time images are viewed on the monitor and recorded if needed.

Features of Veterinary Ocular Ultrasound Devices:

 

  • High-frequency probes (10–20 MHz) for superior resolution
  • Digital display with image-storage capability
  • Both A-mode and B-mode in a single device
  • Suitable for small animals (dogs, cats, rabbits) and large animals (horses, cattle)
  • Some models can connect to a computer for more detailed data analysis