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The horse has a "visual streak", or an area within the retina, linear in shape, with a high concentration of ganglion cells (up to 6100 cells/mm 2 in the visual streak compared to the 150 and 200 cells/mm 2 in the peripheral area). [12] Horses have better acuity when the objects they are looking at fall in this region.
In ophthalmology, gonioscopy is a routine procedure that measures the angle between the iris and the cornea (the iridocorneal angle), using a goniolens (also known as a gonioscope) together with a slit lamp or operating microscope. [1] [2] Its use is important in diagnosing and monitoring various eye conditions associated with glaucoma.
Iris Gonioscopy of the anterior chamber angle. Schwalbe's line is the anatomical line found on the interior surface of the eye's cornea, and delineates the outer limit of the corneal endothelium layer. Specifically, it represents the termination of Descemet's membrane. [1] In many cases it can be seen via gonioscopy. [2]
The anterior chamber angle is a part of the eye located between the cornea and iris which contains the trabecular meshwork. The size of this angle is an important determinant of the rate aqueous humour flows out of the eye, and thus, the intraocular pressure. The anterior chamber angle is the structure which determines the anterior chamber depth.
It should not however, be used as a replacement for the gonioscopy examination but rather be used as a means of refuting or confirming the results of a gonioscopy examination. [ 3 ] The Van Herick's technique has become the most commonly used qualitative method of assessing the size of the anterior chamber angle (ACA).
1860 engraving depicting the performing horse Marocco. A significant portion of medieval technical literature consists of treatises on veterinary care. [S 11] Arab and Muslim scholars made notable contributions to the knowledge of equine medicine, education, [5] and training, in part due to the contributions of the translator Ibn Akhî Hizâm, who wrote around 895, [6] and Ibn al-Awam, who ...
"Moon blindness" on an Icelandic horse Advanced stage of disease Advanced stage of disease ERU on an Icelandic horse. Equine recurrent uveitis (ERU) – also known as moon blindness, recurrent iridocyclitis, or periodic ophthalmia [1] – is an acute, nongranulomatous inflammation of the uveal tract of the eye, occurring commonly in horses of all breeds, worldwide.
Open-angle glaucoma (OAG) and closed-angle glaucoma (CAG) may be treated by muscarinic receptor agonists (e.g., pilocarpine), which cause rapid miosis and contraction of the ciliary muscles, this pulls the scleral spur and results in the trabecular meshwork being stretched and separated.