Effect of mydriasis induced by topical instillations of 0.5% tropicamide on the anterior segment in normotensive dogs using ultrasound biomicroscopy

Abstract

Mydriasis induced by topical 0.5% tropicamide results in modification of the anterior segment which may influence the drainage of aqueous humor.

Effects of 1% cyclopentolate hydrochloride on anterior segment parameters obtained with Pentacam in young adults

“…This study also reported that the ACD increase could also be detected using an A-scan ultrasonographic examination (34) . Finally, an animal study performed using UBM also reported an increase in ACA values following mydriasis (using 0.5% tropicamide) (35) . Here, the increase in ACA and ACV following pharmacological dilation was attributed to the backward movement of the iris lens diaphragm as a result of longitudinal ciliary muscle contraction (32) .…”

Eye

“…Concurrent ocular pregnancy onward. [26][27][28][29][30][31][32][33][34] Recent advancements in biomicroscopy transducer design allows for imaging without the use of cumbersome water baths and general anesthesia as described in initial veterinary reports. 62 The postnatal development of corneal thickness in cats measured by ultrasound biomicroscopy has also been reported.…”

“…62 The postnatal development of corneal thickness in cats measured by ultrasound biomicroscopy has also been reported. [29][30][31]33,34 [26][27][28][29][30][31][32][33][34] Recent advancements in biomicroscopy transducer design allows for imaging without the use of cumbersome water baths and general anesthesia as described in initial veterinary reports.…”

“…allows for visualization of the corneal epithelium, corneal endothelium, limbus, iris, ciliary process, and anterior lens capsule ( Figure 5-35). [26][27][28][29][30][31][32][33][34] Since a scleral spur is not present in the dog or with hypermature cataracts and uncommon in eyes with immature cataracts. Standards for quantitative assessment of the anterior chamber and drainage angle structures have been proposed in literature on ultrasonography in humans.…”

“…3 Since then, multiple reports on the normal B-mode ultrasonographic appearance of the canine and equine eye have been published. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Radiography, computed tomography (CT), and magnetic resonance imaging (MRI) are other diagnostic imaging modalities capable of providing detailed information about the eye, orbit, and periorbital tissues. In addition, the retrobulbar soft tissues may be imaged.…”