Focusing and accommodation in tuatara (Sphenodon punctatus)

Schmid, Katrina L., Howland, Howard C., & Howland, M. (1992) Focusing and accommodation in tuatara (Sphenodon punctatus). Journal of Comparative Physiology A: sensory, neural, and behavioral physiology, 170(3), pp. 263-266.

View at publisher


Photorefraction and photokeratometry were performed on two juvenile tuatara (Sphenodon punctatus, 7 years of age, total length approx. 27cm). Sphenodon is the only surviving genus of the Rhynchocephalia, an order of reptiles. Both existing species are endangered and are found only in New Zealand. Even though Walls (1942) has stated that the ciliary muscle is relatively weak in tuataras, we observed 8 D of accommodation. The eyes were found to focus independently and we could induce an anisometropia of 6 D. The average corneal power of the tuatara was found to be 101 D.

Impact and interest:

4 citations in Scopus
4 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 4090
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see link) or contact the author. Author contact details:
Keywords: Tuatara, Sphenodon punctatus, Accommodation, Photorefraction, Corneal curvature
DOI: 10.1007/BF00191413
ISSN: 1432-1351
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1992 Springer
Copyright Statement: The original publication is available at SpringerLink
Deposited On: 15 Jun 2006 00:00
Last Modified: 31 May 2016 23:39

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page