Calculation of posterior chamber intraocular lens (IOL) size and dioptric power for use in pet rabbits undergoing phacoemulsification
| Autor: | Rick F. Sanchez, Richard Lam, Ronald Becker, Charlotte Dawson, Natalia Escanilla |
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| Rok vydání: | 2016 |
| Předmět: |
medicine.medical_specialty
genetic structures 040301 veterinary sciences medicine.medical_treatment Combined use Emmetropia Capsular tension ring Refraction Ocular 0403 veterinary science 03 medical and health sciences 0302 clinical medicine Lens Implantation Intraocular Implant size Ophthalmology medicine Animals Retinoscopy Lenses Intraocular Phacoemulsification General Veterinary medicine.diagnostic_test business.industry Pets Posterior Eye Segment 04 agricultural and veterinary sciences eye diseases Surgery Posterior chamber intraocular lens Calibration 030221 ophthalmology & optometry Rabbits sense organs business Wild rabbit Optometry |
| Zdroj: | VETERINARY OPHTHALMOLOGY |
| ISSN: | 1463-5216 |
| DOI: | 10.1111/vop.12405 |
| Popis: | Objectives To calculate the size and dioptric power of a posterior chamber intraocular lens (IOL) to achieve emmetropia in adult rabbits and to compare the dioptric power calculation results using a proprietary predictive formula to a retinoscopy-based method. Animals studied Three wild rabbit cadavers, seven pet rabbits with cataracts and ten healthy pet rabbits. Materials and Methods Implant size was calculated using a capsular tension ring (CTR) (Acrivet®, Berlin, Germany). Published and cadaveric biometric data were used in the predictive formula. An IOL power-escalation study compared the predicted values to the refraction results of one pet rabbit (P1) fitted with a + 41D canine IOL (Acrivet®) and six pet rabbits (P2-P7) fitted with prototype IOLs (Acrivet®). Retinoscopy of 10 healthy pet rabbits served as controls. Results A 13.5 mm CTR fitted in all rabbits and permitted the use of a 13 mm IOL. The predicted IOL power ranged between +24D and +25D. The +41D IOL resulted in a refraction error of +8D. Progressive recalculation through a calibration formula led to the insertion of three +49D IOLs in two pet rabbits and a refraction of +6D to +8D, followed by seven +58D IOLs in four pet rabbits and a refraction median of 0D (range: −1.5D to +1D). Conclusions A 13 mm prototype IOL of +58D achieves emmetropia and is of adequate size for rabbits. The combined use of a CTR and retinoscopy is a useful method to calculate the size and refractive power of a new, species-specific, veterinary IOL. |
| Databáze: | OpenAIRE |
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