doi:10.5455/vetworld.2013.274-276 A retrospective study of ocular occurrence in domestic animals: 799 cases

Aim: The present study was conducted to determine the approximate prevalence, distribution and different types of ocular disorders in domestic animals. 
 
Material and Methods: A retrospective study of ocular affections in domestic animals was conducted at referral veterinary polyclinic, Indian Veterinary Research Institute, Izatnagar from January 2002 to December 2011. The data obtained were analysed after calculating percent of distribution. 
 
Results: Totally 799 animals were affected among which Canines and Equines were most commonly affected, followed by Cattle, Buffaloes, Caprines, Felines, Avian and lab animals. Among the disease conditions corneal opacity showed higher incidence and the Caprines and buffaloes were the most affected. Equines and canines highly affected by ocular setariasis and traumatic injury respectively. Cataract incidences were high in spitz breed and cherry eye affect mostly the Neapolitan mastiff. As per age mostly animals of more than 5 years were affected except in Caprines, ages between 1to 5 years were most commonly affected. Left side of the eye was most commonly affected than the right side and fewer incidences were noted in both sides of the eye. Sex wise distribution showed increased incidences of eye diseases in male canines and equines and, female cattle, buffaloes and caprines. 
 
Conclusion: Based on this study we concluded that traumatic injury and ocular setariasis are more common in Canines and Equines respectively.


Introduction
tion was collected as per the format and the data were analyzed after calculating the percent of distribution.Due to lack of awareness among the farmers and clinicians, the ocular problems in domestic animals are

Results and Discussion
getting worsen day by day.It is not easy to diagnose There has been a dramatic increase in the ocular them in earlier cases with the naked eyes.In order to cases for the past ten years from January 2002 to diagnose the eye disorders, we need much more December 2011.Totally 799 cases were affected facilities.The impairment of vision caused by these during this period.The year wise hospital occurrence diseases in working animals, pets and performing was 4.38% (2002-2003, 35 cases), 5.38% (2003-2004, animals causes a greater economic loss to the farmers 43 cases), 5.88% (2004)(2005)47 2011-2012, 144 cases).We could prevalence and document the types of eye defects in infer from the current study that there has been increase population of different domestic animals which are of awareness regarding ocular problems among the commonly encountered in the polyclinics.This study owners.These data were also comparable to the data of also brings to light the darker part of the ocular affections Kalaiselvan et al. [3].In the ocular region, the eyelids, in domestic animals, which remains unnoticed.
cornea or conjunctiva and lens may be affected with

traumatic injuries and certain congenital or acquired tumourous growth [4]. A study was conducted among the domestic
The incidence of tumours and dermoid growth animals which were treated for eye disorders in the was more common in bovines 17.14% and canines referral clinic of Indian veterinary research institute, 5.88% In bovines and canines tumour growths are most Izatnagar during the period of 10 years from January commonly seen in the eyelids and palpebral 2002 to December 2011.These data (Table-1) were conjunctiva of the lower eye lid.In canines spitz and analysed based on the basis of species, age, and sex, German shepherd breeds were most commonly affections of eye and disease conditions.The informa-affected then non descript animals.Reports suggest have lost its eye sight because of chronic disease.that river buffaloes are most commonly affected [5] Equines were generally more prone for ocular worm infestations [13], who were also found the higher followed by horse [6] and then camels [7].Tumour percentage of ocular affections in Canines.The removal by electrocautery may lead to disfigurement infestation occurs in Equines when infected mosquito of the eyelid and hence this method can be avoided.
laying the larva around the eye while feeding and the Aquino et al suggested that plastic reconstruction of larva migrated to the anterior chamber and cause eyelid can be an alternative for electrocautery [8], damage to the eye Damage to the eye caused by Dermoid may occur due to the defective induction serrated cuticle of worm and movement of larva [14] In (skin instead of corneal epithelium) by corneal stromal another study conducted by Thangadurai et al.,mesenchyme [9].
revealed that equine recurrent uveitis, commonly Canine and equine were found to have the highest referred to as moon blindness was the major vision incidence of eye disorders among all the species.The threatening disorder in horse population[15] Affected 10 years data reflected the following numbers viz.
other solid particles that are thrown up by hooves Corneal opacity was high in Caprine (38.88%), during high speed races on a sandy race track [17].Buffaloes (37.14%), and Canines (29.41%), followed Equine eye is enclosed with orbit but because of large by Cattle (28.57%),Equines (28.09%),Avian (25%) size, prominent eye ball of horse may be the risk factor and Felines (25%).In a study conducted by Osmani et for causing injury by blunt trauma and penetrating al., in Bangladesh occurrence of corneal opacity was injury [18].found to be 208 out of the 19025 Cattle surveyed, the Breed wise data among dogs revealed that spitz prevalence being 1.09%.The disease occurred more had the higher incidences of cataract (60%), frequently in young animals (43.88%) than in adults Neopolitan Mastiff showed the maximum occurrence (15.11%) [10].The incidence of corneal opacity among of cherry eye (62.8%).The other commonly affected grazing animals were 2.2% among which the cross animals were mongrels, followed by German bred cows accounted for 34%, Hariyana Cattle 27.6%, Shepherd, Lhasa apso, Labrador, Doberman, Cocker Buffaloes 23.5%, Goats 8.5%, Sheep 5.8% [11].The Spaniel, Boxer and Great Dane.In others species there main reason behind the corneal opacity in contrast with was no significant difference in breed wise occurrences.other eye disorders was attributed to poor management Cataract is the most common eye affections in dogs, lead to vision deficit.Many intraoperative complicaof commonly occurring injuries like external trauma, tions occur due to lack of instruments like operative foreign bodies, violence and parasites [12].microscope and phacoemulsifier unit etc., [19] A study This survey also included the Equine ocular shows that nictating membrane prolapse was more setariasis, showed the higher incidence (57.02%).
common in Neapolitan mastiff [20], which can be Among 138 cases of occular setariasis (Including both removed by using conjunctival pocket technique [21] the sexes and all the age groups) which were undergone while Herrera inferred that replacement of the gland treatment in referral clinic, 116 cases were completely was the first line of treatment [22].cured after removal of parasites.Remaining 20 cases failed to achieve the success, and two cases seemed to The age wise studies of dogs revealed that the