Diagnostic ophthalmology. Squamous cell carcinoma.

The research article deals with a case study of an 18-year old male horse suffering from an enlarging mass on its right lower eyelid, which was examined and diagnosed at the Western College of Veterinary Medicine’s ophthalmology service.

Clinical Examination and Testing

• In the initial examination, the horse’s menace responses, and palpebral, oculocephalic, direct and consensual pupillary light reflexes were present in both eyes, indicating that these basic eye functions were normal.
• Subsequently, a Schirmer Tear Test was conducted, revealing a value of 25 mm/min in the left eye and over 35 mm/min in the right eye. This test measured the amount of tear production, which was more in the right eye.
• Intraocular pressure, or the fluid pressure in the eyes, was also checked using an applanation tonometer and it was recorded as 26mm Hg in both eyes, which is within the normal range.
• The eyes were also tested with Fluorescein staining, which came out negative for both eyes. This test indicates the presence or absence of any corneal abrasions or ulcers.
• Excessive tearing was noted from the right eye, which may have been a symptom of the eye mass.
• Erythema (redness) and crusting, which are common signs of solar burns were noticed along the upper and lower eyelids of both eyes. Solar burns are commonly found in horses exposed to excessive sun.
• Detailed measurement and description of the mass was performed, including its size, color and condition (red, ulcerated, 3-cm in diameter) within the right lower eyelid.

Further Diagnostic Tests

• After dilating the eyes with tropicamide, further tests such as biomicroscopic examination and indirect ophthalmoscopy were done, which did not reveal any additional abnormalities in either of the eyes.
• A photographic image of the right eye, possibly documenting the mass, is mentioned but has not been included in the abstract.

Implications of the Study

• The collection of data through various tests and clinical observations is very crucial. This data could form the basis for diagnosis for the mass in the horse’s eye.
• The detailed clinical approach mentioned in the study might, likely, assist in similar future cases, providing a guideline about what course of examinations could be undertaken for proper diagnosis.