{"title":"Sterile granulomatous panuveitis in dogs in the United Kingdom: A review of 33 cases.","authors":"J Burgess, E Scurrell, E Collier, H Featherstone","doi":"10.1111/vop.13178","DOIUrl":"10.1111/vop.13178","url":null,"abstract":"<p><strong>Purpose: </strong>To describe the clinical and histopathological features of a sterile granulomatous panuveitis syndrome in 33 dogs that underwent enucleation and ocular histopathology.</p><p><strong>Methods: </strong>Retrospective review of the medical records and ocular histopathology reports of 33 cases. Inclusion criteria were enucleation in conjunction with characteristic clinical and histopathological features.</p><p><strong>Results: </strong>Thirteen breeds were represented (including crossbreeds). Panuveitis was acute and fulminating, and secondary glaucoma was common (n = 27). Interval from initial presentation to enucleation was 99 days (median 33 days, range 5-605 days). The mean age at enucleation was 6.7 years. Ocular signs were initially unilateral (n = 18) or bilateral (n = 15). The disease became bilateral in 18/25 cases that initially underwent unilateral enucleation, resulting in enucleation or euthanasia in 9/18 (mean interval of 168 days). Seven out of 59 eyes had a good outcome following topical anti-inflammatory and systemic immunosuppressive therapy. None of the dogs had travel history nor relevant systemic signs from presentation to follow-up (mean 619 days, range 16-3012 days). Histopathology revealed histiocytic and lymphoplasmacytic panuveitis with pigment dispersion, and no infectious agents were identified on light microscopy.</p><p><strong>Conclusion: </strong>To the authors' knowledge, this is the first report of a sterile granulomatous panuveitis syndrome in dogs in the UK. The clinical signs are severe, with rapid progression, and can result in bilateral enucleation or euthanasia in affected dogs. There does not appear to be an age or breed predisposition, however further research is necessary in this regard. Early and aggressive intervention, with both topical and systemic immunosuppressive therapy, is recommended to reduce the risk of blindness, enucleation, and euthanasia.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"434-446"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139567179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of visual outcomes between medical treatment alone and Ahmed glaucoma valve implantation in Shiba dogs with primary angle closure glaucoma.","authors":"Akira Kubo, Yosuke Ito","doi":"10.1111/vop.13189","DOIUrl":"10.1111/vop.13189","url":null,"abstract":"<p><strong>Objective: </strong>The objective of the study was to evaluate visual outcomes between medical treatment alone (MED) and Ahmed glaucoma valve implantation (AGVI) in Shiba dogs with primary angle closure glaucoma (PACG).</p><p><strong>Procedures: </strong>Records of 65 Shiba dogs (104 eyes) with PACG were retrospectively reviewed. Vision was assessed qualitatively using both the menace response and maze testing. The significance of age, sex, intraocular pressure (IOP), and duration of clinical signs (≤72 h or >72 h) at first presentation (V1) was assessed. Eyes with vision at V1 were divided into groups according to subsequent treatment method (MED versus AGVI), and vision as a survival outcome was compared between group by the Kaplan-Meier method.</p><p><strong>Results: </strong>At V1, 65 eyes (62.5%) of 54 dogs had vision. There was no statistically significant difference in age or sex on the presence of vision at V1. Median IOP was higher in blind (52 mmHg) compared to sighted eyes (28 mmHg) (p < .001). Eyes presenting in ≤72 h of the onset of clinical signs were more likely to have vision (86.7%) compared to those presenting after 72 h (44.1%) (p < .001). By the Kaplan-Meier analysis, the cumulative visual retention rate was significantly higher with AGVI than with MED (69.2% vs. 7.7%; p < .01) at 12 months. The median time to visual loss was 39.9 months with AGVI vs. 1.7 months with MED.</p><p><strong>Conclusions: </strong>AGVI resulted in better visual outcomes than MED and should be considered in Shiba dogs with PACG that are visual at the time of presentation and suitable for surgery.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"452-460"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139692994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodrigo García-Santisteban, Mónica Anayatzin Linares-Alba, Andrés Botello-Bárcenas, Paola Margay, Carlos Soto, Joice Fonzar-Furtado, Dennis Brooks, Diego García, Gustavo Adolfo García Sánchez
{"title":"Subconjunctival liposomal sirolimus vs. cyclosporine or tacrolimus as treatment of keratoconjunctivitis sicca in dogs: A double-blind, randomized study.","authors":"Rodrigo García-Santisteban, Mónica Anayatzin Linares-Alba, Andrés Botello-Bárcenas, Paola Margay, Carlos Soto, Joice Fonzar-Furtado, Dennis Brooks, Diego García, Gustavo Adolfo García Sánchez","doi":"10.1111/vop.13190","DOIUrl":"10.1111/vop.13190","url":null,"abstract":"<p><strong>Purpose: </strong>To compare the safety and efficacy of a 100 microgram subconjunctival injection of liposome-encapsulated sirolimus (SCJS) to cyclosporine (CsA) or tacrolimus (CsA/T) for the treatment of keratoconjunctivitis sicca (KCS) in dogs.</p><p><strong>Methods: </strong>Dogs with signs and symptoms of KCS were block-randomized to one of two treatment groups: Biweekly SCJS or conventional treatment (CsA/T). Schirmer tear test 1 (STT-1) scores, conjunctival hyperemia (CH) scores, corneal opacity (CO) scores, and clinical evaluation of potential side effects were recorded every 2 weeks for 14 weeks for both groups. Differences between groups were analyzed using the mixed results ANOVA and U-Mann Whitney tests (p < .05 was considered significant).</p><p><strong>Results: </strong>A total of 30 eyes were included in the study, of which 20 eyes completed follow-up. There was no statistically significant interaction between the treatment group and time on STT-1 score (p = .165), and median CH and CO scores showed no statistically significant differences between groups (p = .353 and p = .393, respectively). There were no clinically significant side effects present in any subject at any time.</p><p><strong>Conclusion: </strong>In this trial, a 1 mg/mL (100 micrograms) SCJS every 2 weeks showed similar safety and efficacy profiles as daily CsA/T in dogs with KS after 14 weeks of treatment. Larger studies should be performed to further assess SCJS as an alternative treatment for KCS.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"461-468"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139703536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Harun Cinar, Latif Emrah Yanmaz, Muhammed Yusuf Sirin
{"title":"Effects of intranasal and intramuscular administration of butorphanol and zolazepam-tiletamine combination on intraocular pressure and tear secretion in New Zealand White rabbits.","authors":"Harun Cinar, Latif Emrah Yanmaz, Muhammed Yusuf Sirin","doi":"10.1111/vop.13192","DOIUrl":"10.1111/vop.13192","url":null,"abstract":"<p><p>This study aimed to compare the effect of intranasal (IN) and intramuscular (IM) administration of butorphanol and zolazepam-tiletamine (ZT) combination on intraocular pressure (IOP) and tear secretion (TS) in rabbits. Fourteen healthy male New Zealand White rabbits weighing 3.05 ± 0.72 kg, aged between 1 and 2 years old, were included in the study. Animals randomly received 0.5 mg/kg butorphanol and 15 mg/kg ZT combination either with IN or IM administration. IOP and TS were measured at baseline (T0), and followed by 5, 15, 30, 45, and 60 min after drug administration. The sedation variables, the time to onset of sedation, duration of sedation, and sedation scores were also recorded. The route of administration for the butorphanol and ZT combination had no significant effect on the mean IOP (p = .301) and TS (p = .445). Furthermore, there were no significant changes observed in the IOP (p = .472) and TS (p = .348) over time. The time to onset of sedation was earlier in the IN group (4.57 ± 0.79 min) than in the IM group (5.86 ± 0.9 min; p = .0004). The duration of sedation was significantly longer for IM (57.43 ± 3.41 min) compared with IN (45.0 ± 1.91 min; p < .0001). No significant difference in the sedation score was observed between groups at all time points. In conclusion, both IN and IM administration of the butorphanol and ZT combination in rabbits had similar effects on IOP and TS.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"469-474"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139698436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodrigo S Garcés Torres, Renee T Carter, Hannah B Gafen, Chin-Chi Liu, Andrew C Lewin, Robert A MacLean
{"title":"Longitudinal intraocular pressure measurements in Whooping cranes (Grus americana) and Mississippi-Sandhill cranes (Grus canadensis pulla).","authors":"Rodrigo S Garcés Torres, Renee T Carter, Hannah B Gafen, Chin-Chi Liu, Andrew C Lewin, Robert A MacLean","doi":"10.1111/vop.13170","DOIUrl":"10.1111/vop.13170","url":null,"abstract":"<p><strong>Objective: </strong>To assess intraocular pressure (IOP) development in cranes and determine the impact of age, weight, species, head position, and sex.</p><p><strong>Animals studied: </strong>Whooping cranes (WC) (Grus americana), and Mississippi-sandhill cranes (MSC) (Grus canadensis pulla).</p><p><strong>Procedures: </strong>Chicks were manually restrained on days 1-3, 7, 21, 35, 60, 75, and 120 for routine examinations. IOP was opportunistically measured utilizing the Tonovet Plus® in D setting with the head above the heart (AH) and below the heart (BH). Values were also obtained longitudinally in adults (>120 days old) upon presentation in 1 year.</p><p><strong>Results: </strong>Intraocular pressure was highly correlated with age and weight in chicks. For every kilogram gained, IOP increased 2.46 ± 0.08 mmHg in WC and 2.66 ± 0.11 mmHg in MSC. Once hatched, IOP increased 1.13 ± 0.04 mmHg in WC and 0.87 ± 0.04 mmHg in MSC every 10 days. IOP was similar to adults at 120 days of age. In adult WC, mean IOP AH was 24.0 ± 0.4 mmHg, and BH was 27.9 ± 0.4 mmHg, there was a significant difference regarding head positioning and sex, females (25.3 ± 0.4 mm Hg) had lower IOP than males (26.5 ± 0.4 mmHg). In adult MSC, mean IOP AH was 20.7 ± 0.4 mmHg, and BH was 24.6 ± 0.4 mmHg. The difference between head positioning was significant.</p><p><strong>Conclusions: </strong>This study documents the correlation between IOP and weight or age during early development in cranes, as well as the importance of head positioning.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"414-423"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139088764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maria Cabrero, Alexandre Guyonnet, Emmanuel Risi, Aurelie Bourguet
{"title":"Nutritional cataracts in a wolf litter treated by phacoemulsification.","authors":"Maria Cabrero, Alexandre Guyonnet, Emmanuel Risi, Aurelie Bourguet","doi":"10.1111/vop.13206","DOIUrl":"10.1111/vop.13206","url":null,"abstract":"<p><strong>Objective: </strong>To describe the clinical findings in a wolf litter with nutritional cataracts and determine the treatment outcomes after phacoemulsification.</p><p><strong>Procedure: </strong>Bilateral nutritional cataracts were diagnosed in four hand-fed 10-week-old wolves (Canis lupus). The information collected included signalment, physical and ophthalmic examination findings, ocular ultrasonography and electroretinography results, and postoperative outcomes.</p><p><strong>Results: </strong>All four wolves were rejected from the dam and hand raised with a commercial artificial milk replacer from 5 days of age until weaning at 6 weeks of age. At initial presentation, bilateral cataracts were observed in all patients (8/8 eyes), with vision deficits in three of the four wolves. The main ophthalmic anomalies were mature cataracts with lens-induced uveitis (3/8 eyes, two wolves), immature cataracts (1/8 eyes, one wolf), and perinuclear and posterior cortical/subcapsular lens opacities (4/8 eyes, three wolves). Three of the four wolves (six eyes) underwent bilateral one-handed phacoemulsification with intraocular lens implantation. At the last examination 2 months following surgery, all operated eyes (6/6) were visual, Elschnig pearl proliferation was present in 2/6 eyes, and mild posterior capsular opacification was observed in 6/6 eyes. In the nonoperated wolf, the cataracts remained stable and did not affect the visual axis of either eye.</p><p><strong>Conclusions: </strong>This is the first description of phacoemulsification surgery in wolves. Phacoemulsification is a viable treatment option for captive wolves with nutritional cataracts. Special attention should be paid to hand-raised cubs to ensure that adequate amino acid levels are present in artificial milk.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"475-480"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140159145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seyed Mehdi Rajaei, Houman Faghihi, Fatemeh Zahirinia
{"title":"The Shih Tzu eye: Ophthalmic findings of 1000 eyes.","authors":"Seyed Mehdi Rajaei, Houman Faghihi, Fatemeh Zahirinia","doi":"10.1111/vop.13182","DOIUrl":"10.1111/vop.13182","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the frequency of ophthalmic disorders in Shih Tzus.</p><p><strong>Animals: </strong>Five hundred client-owned Shih Tzu dogs (1000 eyes).</p><p><strong>Procedures: </strong>Medical records of 500 Shih Tzu dogs were reviewed and ophthalmic examination data were collected and analyzed.</p><p><strong>Results: </strong>In total, out of 1000 eyes, 964 (96.4%; OD: 480 eyes, OS: 484 eyes) had at least one ophthalmic abnormality, and only 36 eyes (3.6%; OD: 20 eyes, OS: 16 eyes) were diagnosed as normal. A total of 1375 individual ophthalmic abnormalities were observed in 964 diseased eyes. Fifty-nine different unique diagnoses were made in the study population, and only three conditions [medial canthal entropion (10.4% of eyes; bilateral in 10.2% of dogs), caruncular trichiasis (21.1% of eyes; bilateral in 20.2% of dogs), and reduced tear film breakup time (17.6% of eyes; bilateral in 17.4% of dogs)] affected 49.1% of the eyes.</p><p><strong>Conclusion and clinical relevance: </strong>Findings suggested that the most prevalent disorders for the Shih Tzus were hairy caruncle, reduced TBUT, medial canthal entropion, keratoconjunctivitis sicca, pigmentary keratitis, lagophthalmos, and mature cataract.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"447-451"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139088765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A K Shukla, A Contadini, K Kazmir-Lysak, M Schnyder, C Gerspach, S A Pot
{"title":"Intraocular Parafilaria bovicola infection and surgical removal in a mixed breed heifer.","authors":"A K Shukla, A Contadini, K Kazmir-Lysak, M Schnyder, C Gerspach, S A Pot","doi":"10.1111/vop.13211","DOIUrl":"10.1111/vop.13211","url":null,"abstract":"<p><p>An approximately 1.5-year-old mixed breed heifer was presented for evaluation and treatment due to ocular pain affecting the right eye secondary to a live nematode within the anterior chamber. Ophthalmic examination revealed marked blepharospasm, evidence of chronic keratitis, uveitis, and a single, white, approximately 2.5 cm long, 0.5 mm thick, living parasite. The heifer underwent general anesthesia, and the parasite was removed using passive aqueous humor outflow following a stab incision into the anterior chamber. Twenty-four hours after removal of the intraocular parasite, the heifer displayed a significant improvement in ocular comfort, corneal edema, and uveitis. The nematode was identified via genetic analyses as Parafilaria bovicola, a filarial parasite of cattle. The heifer was discharged 5 days following nematode removal with a marked improvement in all ocular signs and apparently normal vision. To the authors' knowledge, there are no previous reports of confirmed intraocular filariosis caused by P. bovicola in the veterinary literature, nor are there reports detailing surgical removal of intraocular parasites in bovids.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":"481-487"},"PeriodicalIF":1.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140194709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bahar Golzar, Ali Asghar Sarchahi, Mohammad Azizzadeh
{"title":"Evaluation of lidocaine for auriculopalpebral nerve block in dogs: Onset, duration, and effects on intraocular pressure and eye examination.","authors":"Bahar Golzar, Ali Asghar Sarchahi, Mohammad Azizzadeh","doi":"10.1111/vop.13263","DOIUrl":"https://doi.org/10.1111/vop.13263","url":null,"abstract":"<p><strong>Objectives: </strong>Accurate intraocular pressure (IOP) measurement is essential for managing glaucoma, requiring tonometry. Local anesthesia is typically used, but nerve blocks may be needed for blepharospasm. This study investigated the efficacy of auriculopalpebral nerve block with lidocaine in achieving eyelid akinesia and its influence on IOP in dogs.</p><p><strong>Animals and procedures: </strong>In a randomized, blinded trial, 12 healthy adult mixed-breed dogs (24 eyes) received either auriculopalpebral nerve block with 2% lidocaine (n = 12 eyes) or no block (n = 12 eyes). Tetracaine drops were used for topical anesthesia in half of blocked/non-blocked eyes, and the rest of the eyes got artificial tears as control. The impact of nerve block was evaluated through assessments of menace response, palpebral reflex, and IOP before the block, after drop instillation, and at 15-min intervals until block dissipation.</p><p><strong>Results: </strong>Auriculopalpebral nerve block provided effective eyelid akinesia in 58.5% (7/12 eyes) at 15 min, reaching 91.7% (11/12 eyes) at 30 min, indicating peak efficacy. Subsequently, the block gradually diminished, with 66.7% (8/12 eyes) and 33.3% (4/12 eyes) maintaining akinesia at 45 and 60 min, respectively. Importantly, neither auriculopalpebral nerve block nor tetracaine administration significantly affected IOP measurements (p > .05).</p><p><strong>Conclusions: </strong>Auriculopalpebral nerve block using lidocaine demonstrated efficient eyelid akinesia, peaking at 30 min postinjection. This technique proved to be safe with no notable alterations in IOP, suggesting its potential utility in canine ophthalmology for procedures requiring eyelid akinesia, particularly in the management of glaucoma where maintaining accurate IOP measurements is crucial for diagnosis, treatment, and monitoring the disease.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142112726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karin W Handel, Ron Ofri, Yulia Goncharov, Dikla Arad, Lionel Sebbag
{"title":"Evaluation of 0.1% and 1% atropine eyedrops in cats: A comparative study of tolerance, stability, and efficacy.","authors":"Karin W Handel, Ron Ofri, Yulia Goncharov, Dikla Arad, Lionel Sebbag","doi":"10.1111/vop.13268","DOIUrl":"https://doi.org/10.1111/vop.13268","url":null,"abstract":"<p><strong>Objective: </strong>Investigate the tolerance, stability, and efficacy of topical 0.1% and 1% atropine in cats.</p><p><strong>Procedures: </strong>Six cats underwent two trials separated by a 2-week washout period. One drop of artificial tears was placed in one randomly selected eye (control), and one drop of either 0.1% atropine (Trial I) or 1% atropine (Trial II) was placed in the other eye. Immediate adverse effects were recorded for severity (0-3) and duration (seconds). Horizontal pupil diameter (HPD), pupillary light reflexes (PLRs), intraocular pressure (IOP), Schirmer tear test-1 (STT-1), and heart rate (HR) were monitored at baseline then 8 h post-administration. PLRs were assessed for a total of 72 h. Stability was assessed weekly for 1 month in room temperature and refrigerated conditions, evaluating solution clarity, pH, and drug concentrations.</p><p><strong>Results: </strong>Adverse effects had a significantly lower severity score and shorter duration with 0.1% versus 1% atropine (severity 1.2 ± 0.4 vs. 2.5 ± 0.5, p = .010; duration 107.5 ± 53.3 vs. 293.3 ± 106.5 s, p = .009). HPD was significantly greater than baseline measurements as early as 40 min for both atropine formulations. Pupils were non-responsive for a significantly shorter duration with 0.1% versus 1% atropine (median 7 h vs. 47.5 h, p = .031). Compared with control eyes, IOP was significantly elevated by 1% atropine (p = .021) but not 0.1% atropine (p = .502). No significant differences were noted in STT-1 and HR measurements. Both solutions were stable in room temperature and refrigerated conditions for 1 month.</p><p><strong>Conclusions: </strong>Diluted 0.1% atropine was stable and better tolerated by cats, offering a potential alternative to feline patients that experience adverse effects from topical 1% atropine.</p>","PeriodicalId":23836,"journal":{"name":"Veterinary ophthalmology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142037079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}