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Titolo:
Description of ciliary body anatomy and identification of sites for transscleral cyclophotocoagulation in the equine eye
Autore:
Miller, TL; Willis, AM; Wilkie, DA; Hoshaw-Woodard, S; Stanley, JRL;
Indirizzi:
Ohio State Univ, Dept Vet Clin Sci, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 et Clin Sci, Columbus, OH 43210 USA Ohio State Univ, Biostat Program, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 tat Program, Columbus, OH 43210 USA Ohio State Univ, Dept Vet Biosci, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 Vet Biosci, Columbus, OH 43210 USA
Titolo Testata:
VETERINARY OPHTHALMOLOGY
fascicolo: 3, volume: 4, anno: 2001,
pagine: 183 - 190
SICI:
1463-5216(200109)4:3<183:DOCBAA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLAUCOMA; HORSES; DOGS;
Keywords:
ciliary body; cyclophotocoagulation; equine; glaucoma; pars plana; pars plicata;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Miller, TL N Carolina State Univ, Coll Vet Med, 4700 Hillsborough St, Raleigh, NC 27606 USA N Carolina State Univ 4700 Hillsborough St Raleigh NC USA27606
Citazione:
T.L. Miller et al., "Description of ciliary body anatomy and identification of sites for transscleral cyclophotocoagulation in the equine eye", VET OPHTHAL, 4(3), 2001, pp. 183-190

Abstract

Objective To determine the most appropriate anatomical location for diode laser probe placement to accurately photoablate the equine ciliary body using a contact, transscleral approach. Design Original research. Procedures Forty-two freshly enucleated adult equine eyes were evaluated. The horizontal, medial vertical, central vertical, and lateral vertical lengths of the cornea were measured from limbus to limbus. Needles were inserted perpendicular to the sclera at specific distances posterior to the external limbus at the 1, 2, 4, 5, 6, 7, 8, 10, 11 and 12 o'clock positions. Theper cent frequency that needles penetrated internal anatomical regions (lens, lens zonules, pars plicata, anterior, middle, and posterior pars plana,ora ciliaris retinae, or retina), when inserted at 2, 4, 6, and 8 min posterior to the limbus, were calculated for all eyes combined, for right vs. left, for males vs. females, and for three age groups. The internal distancefrom the limbus to the anterior pars plana, and from the anterior pars plana to the ora ciliaris retinae were also measured in six of the horses (12 eyes). Mean distances and standard deviations were computed for all parameters. Results Average corneal sizes and standard deviations were: 30.24 mm +/- 1.53 (horizontal); 24.69 mm +/- 1.52 (central vertical); 22.79 mm +/- 1.49 (medial vertical); and 19.79 mm +/- 1.55 (lateral vertical). Internal distances of the pars plicatas ranged from 5.33 mm +/- 0.49 to 10.67 mm +/- 1.15. Internal distances of the pars planas ranged from 0.33 mm +/- 0.49 to 3.17mm +/- 0.39. High probabilities of penetrating the pars plicata correspondto positions 4 min posterior to the external limbus dorsotemporal 10, 11 o'clock (OD), and 1, 2 o'clock (OS), dorsonasal 1 o'clock (OD) and 11 o'clock (OS), and ventrotemporal 5-7 o'clock (OU). Low probabilities of penetrating the pars plicata correspond to positions ventronasal 4 o'clock (OD), 8 o'clock (OS) and dorsonasal 2 o'clock (OD), 10 o'clock (OS) at 4 and 6 mm posterior to the external limbus as well as ventrotemporal 4 o'clock (OS), 8 o'clock (OD) at 6 min posterior to the external limbus. Conclusions Transscleral cyclophotocoagulation may be a viable alternativeto medical therapy for control of intraocular pressure in horses with glaucoma. Overall, the most accurate anatomical position on the sclera for cyclophotocoagulation of the equine eye is 4-6 min posterior to the limbus, avoiding the nasal quadrants. Accurate transscleral cyclophotocoagulation should optimize the therapeutic outcome and minimize potential side-effects such as retinal detachment and cataract formation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/20 alle ore 12:56:05