Peer-reviewed veterinary case report
Corneal astigmatism after two types of eye surgery cuts in dogs
By Pederson, Samantha L et al.·Published in Veterinary ophthalmology·2019·Department of Clinical Sciences, United States·View original on PubMed →
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Original publication title: Surgically induced astigmatism in canines following sutured dorsonasal vs dorsotemporal clear corneal incisions.
- Species:
- dog
Plain-English summary
A group of dogs undergoing cataract surgery (bilateral phacoemulsification) had their eyes evaluated for changes in vision after the procedure. The study found that dogs with a specific type of incision (dorsonasal) developed more astigmatism (a vision problem) compared to those with a different incision type (dorsotemporal). While there was an improvement in the overall condition of the cornea a few months after surgery, the type of incision made a significant difference in the amount of astigmatism that developed. This suggests that choosing the right incision technique could help reduce vision problems after surgery.
People also search for: dog cataract surgery recovery · dog eye surgery complications · why is my dog having vision problems after surgery
Abstract
OBJECTIVES: To investigate use of the Pentacam® HR for evaluation of surgically induced corneal astigmatism (SIA) in canines undergoing bilateral phacoemulsification and determine differences between dorsonasal and dorsotemporal clear corneal incisions. ANIMALS: Client-owned canines undergoing bilateral phacoemulsification. PROCEDURES: Patients received anterior segment imaging pre-operatively, immediately post-operatively, and 2-4 months post-operatively (follow-up). Total corneal refractive power was used to determine SIA. Surgically induced astigmatism was compared between right and left eyes, representing dorsotemporal and dorsonasal incisions, respectively. Repeated measures analyses were used between time points and paired t test compared SIA between eyes. RESULTS: Complete imaging series were obtained for seven patients. Follow-up imaging occurred at a median of 112 days (range 60-132 days) post-operatively. For repeated measures analyses, significant differences were found between pre- and immediate post-operative values (P < 0.01), and between immediate post-operative and follow-up values (P < 0.01). There was no significant difference between pre-operative and follow-up values. Surgically induced astigmatism was significantly different between right and left eyes, with values of 2.01 ± 1.24 D and 3.05 ± 1.58 D at 3 mm radius (P < 0.05), and 2.04 ± 1.18 D and 3.06 ± 1.27 D at 4 mm radius (P < 0.05) for dorsotemporal and dorsonasal incisions, respectively. CONCLUSIONS: Preliminary investigation revealed improvement of corneal SIA 2-4 months post-operatively, but development of significantly more SIA in dorsonasal vs dorsotemporal incisions. This prompts consideration of patient or microscope rotation to create a more dorsotemporal incision when possible.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/30884062/