Simultaneous mode A and mode B echobiometry of senile cataractous eyes in dogs

Abstract

The evaluation of lens by ultrasonography, previously to phacoemulsification, can offer relevant information, markedly such as aspects and dimensions, allowing design safer surgical strategies with enhanced outcomes. Within the contents of this research, the biometry was performed in lens of dogs with senile immature, mature, and diabetic cataracts, previously to phacoemulsification, using mode A and mode B ultrasonography, simultaneously. The values obtained for axial diameter of the eyes, anterior chamber, lens, and vitreous chamber were, respectively, 19.22mm, 2.35mm, 7.94mm, and 8.94mm. Diabetic cataractous lens were larger (8.90mm), compared to mature cataract (8.12mm). Lens with immature cataract were smaller in dimension than those with mature and diabetic cataracts. foram, respectivamente, 19,22mm, 2,35mm, 7,94mm e 8,94mm. Lentes cataratogênicas pertencentes a animais diabéticos apresentaram dimensões maiores (8,90mm), comparativamente àquelas que apresentavam catarata madura (8,12mm). Lentes acometidas por catarata imatura apresentaram menor dimensão (7,06mm), comparativamente às demais.

A- and B-modes echobiometry in cataractous and noncataractous eyes of English Cocker Spaniel dogs

“…Williams (2004) employed B-mode ultrasonography to compare normal and cataractous lens in dogs. Lenses with diabetic cataracts were significantly increased in axial thickness compared to lenses in other eyes, although lenses with mature cataracts showed a trend towards increased axial thickness and immature cataracts demonstrated a trend towards reduced thickness (Martins et al, 2010). van der Woerdt et al (1993) found changes in the refractive media, notably vitreous degeneration and retinal detachment in eyes examined by ultrasonography.…”

“…Through the centuries, it became non congenital cataracts, closed angle glaucoma, progressive retinal atrophy, retinal dysplasia, and keratoconjunctivitis sicca (Petersen-Jones, 1999). In North America, the English Cocker Spaniel is one of the eight breeds with the highest cataract prevalence (8.2%) (Gelatt and Mackay, 2005).…”

Exploración ecográfica ocular básica en perros (modo B tiempo real)

“…Desafortunadamente, solo está disponible en equipos ecográficos especiales para oftalmología. La ecografía en modo A es útil para realizar medidas precisas de longitud y profundidad, como el tamaño del globo ocular y la profundidad de la cámara anterior, por ejemplo, y biometría en general (3,4,15); esta última es una ecografía ocular mucho más detallada que la ecografía ocular básica o general. Debe tenerse presente que aunque el modo A es útil en biometría, tiene ciertas limitaciones por efectos de impedancia, dispersión del haz de ultrasonido y movimiento constante de los ojos, lo cual dificulta la interpretación adecuada de cada pico y siempre se presenta en conjunto con el modo B (figura 4) (3,16).…”