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Home / Equine Research Bank / Am J Vet Res / Evaluation of 30- and 25-diopter intraocular lens implants i...
American journal of veterinary research2010; 71(7); 809-816; doi: 10.2460/ajvr.71.7.809

Evaluation of 30- and 25-diopter intraocular lens implants in equine eyes after surgical extraction of the lens.

Abstract: To determine appropriate intraocular lens (IOL) implant strength to approximate emmetropia in horses. Methods: 16 enucleated globes and 4 adult horses. Methods: Lens diameter of 10 enucleated globes was measured. Results were used to determine the appropriate-sized IOL implant for insertion in 6 enucleated globes and 4 eyes of adult horses. Streak retinoscopy and ocular ultrasonography were performed before and after insertion of 30-diopter (D) IOL implants (enucleated globes) and insertion of 25-D IOL implants (adult horses). Results: In enucleated globes, mean +/- SD lens diameter was 20.14 +/- 0.75 mm. Preoperative and postoperative refractive state of enucleated globes with 30-D IOL implants was -0.46 +/- 1.03 D and -2.47 +/- 1.03 D, respectively; preoperative and postoperative difference in refraction was 2.96 +/- 0.84 D. Preoperative anterior chamber (AC) depth, crystalline lens thickness (CLT), and axial globe length (AxL) were 712 +/- 0.82 mm, 11.32 +/- 0.81 mm, and 40.52 +/- 1.26 mm, respectively; postoperative AC depth was 10.76 +/- 1.16 mm. Mean ratio of preoperative to postoperative AC depth was 0.68. In eyes receiving 25-D IOL implants, preoperative and postoperative mean refractive error was 0.08 +/- 0.68 D and -3.94 +/- 1.88 D, respectively. Preoperative AC depth, CLT, and AxL were 6.36 +/- 0.22 mm, 10.92 +/- 1.92 mm, and 38.64 +/- 2.59 mm, respectively. Postoperative AC depth was 8.99 +/- 1.68 mm. Mean ratio of preoperative to postoperative AC depth was 0.73. Conclusions: Insertion of 30-D (enucleated globes) and 25-D IOL implants (adult horses) resulted in overcorrection of refractive error.
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Publication Date: 2010-07-03 PubMed ID: 20594084DOI: 10.2460/ajvr.71.7.809Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

Summary

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The research paper focuses on the evaluation of two types of intraocular lens implants used in equine eyes after surgical extraction of the lens, with the aim to determine which is closer to approximating emmetropia (optimal eye focus). The findings show that both the 30-diopter and 25-diopter implants result in overcorrection of refractive error.

Methods

  • The study utilized 16 enucleated (removed) globes and 4 adult horses.
  • The lens diameter of 10 enucleated globes was measured to ascertain the right size of intraocular lens implant.
  • The size determined was used to guide the implant insertion in 6 enucleated globes and 4 adult horse eyes.
  • The researchers performed streak retinoscopy and ocular ultrasonography before and after inserting the implants to evaluate changes. The 30-diopter implants were used in the enucleated globes, while the 25-diopter implants were used in the adult horses.

Results

  • The mean lens diameter for the enucleated globes was approximately 20.14 millimeters.
  • For the enucleated globes with 30-diopter implants, the preoperative and postoperative refractive state showed an increase in the difference in refraction.
  • The preoperative measurements for anterior chamber depth, crystalline lens thickness, and axial globe length were taken and compared to the postoperative measurements. The postoperative anterior chamber depth increased significantly.
  • Similarly, for eyes with 25-diopter implants, an increase in the preoperative and postoperative refractive error was observed.
  • Just as with the 30-diopter implants, preoperative measurements for anterior chamber depth, crystalline lens thickness, and axial globe length were compared with postoperative measurements, showing a significant increase in the postoperative anterior chamber depth.

Conclusions

  • The results of the study show that both the 30-diopter (in enucleated globes) and the 25-diopter implants (in adult horses) resulted in an overcorrection of refractive error. This suggests neither intraocular lens implant achieved the ideal state of emmetropia.

Cite This Article

APA
McMullen RJ, Davidson MG, Campbell NB, Salmon JH, Gilger BC. (2010). Evaluation of 30- and 25-diopter intraocular lens implants in equine eyes after surgical extraction of the lens. Am J Vet Res, 71(7), 809-816. https://doi.org/10.2460/ajvr.71.7.809

Publication

American journal of veterinary research
ISSN: 0002-9645
NlmUniqueID: 0375011
Country: United States
Language: English
Volume: 71
Issue: 7
Pages: 809-816

Researcher Affiliations

McMullen, Richard J
  • Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA.
Davidson, Michael G
    Campbell, Nigel B
      Salmon, Jacklyn H
        Gilger, Brian C

          MeSH Terms

          • Animals
          • Anterior Chamber / surgery
          • Anti-Bacterial Agents / administration & dosage
          • Anti-Bacterial Agents / therapeutic use
          • Euthanasia, Animal
          • Eye Enucleation / methods
          • Eye Enucleation / veterinary
          • Horse Diseases / surgery
          • Horses
          • Lens Implantation, Intraocular / methods
          • Lens Implantation, Intraocular / veterinary
          • Lens, Crystalline / anatomy & histology
          • Lens, Crystalline / surgery
          • Lenses, Intraocular / veterinary
          • Refraction, Ocular / physiology
          • Refractive Errors / therapy
          • Refractive Errors / veterinary
          • Refractive Surgical Procedures / methods
          • Refractive Surgical Procedures / veterinary

          Citations

          This article has been cited 4 times.
          1. Slenter IJM, Hermans H, Ensink JM, Willems DS, Veraa S, Grinwis GCM, Boevé MH. Clinical, ultrasonographic, and histopathologic findings in seven horses with Descemet's membrane detachment: A case series. Vet Ophthalmol 2020 Jan;23(1):181-189.
            doi: 10.1111/vop.12710pubmed: 31544302google scholar: lookup
          2. Cerreta AJ, McMullen RJ Jr, Scott HE, Ringenberg JD, Hempstead JE, DeVoe RS, Loomis MR, Minter LJ. Bilateral Phacoemulsification in an African Elephant (Loxodonta africana). Case Rep Vet Med 2019;2019:2506263.
            doi: 10.1155/2019/2506263pubmed: 31380140google scholar: lookup
          3. Meister U, Görig C, Murphy CJ, Haan H, Ohnesorge B, Boevé MH. Intraocular lens power calculation for the equine eye. BMC Vet Res 2018 Apr 3;14(1):123.
            doi: 10.1186/s12917-018-1448-6pubmed: 29615113google scholar: lookup
          4. Meister U, Ohnesorge B, Körner D, Boevé MH. Evaluation of ultrasound velocity in enucleated equine aqueous humor, lens and vitreous body. BMC Vet Res 2014 Oct 14;10:250.
            doi: 10.1186/s12917-014-0250-3pubmed: 25312851google scholar: lookup
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