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RE: Sclerotic rings

To: alflaurf@abs.net, <david.marjanovic@gmx.at>, "The Dinosaur Mailing List" <dinosaur@usc.edu>
Subject: RE: Sclerotic rings
From: Ronald Orenstein <ornstn@home.com>
Date: Sat, 07 Apr 2001 10:11:54 -0400
In-reply-to: <NEBBLFOLPBLDHPMGJHFECEANDOAA.alflaurf@abs.net>
References: <000701c0bec7$ee0be460$b4432fd5@telekabel.at>
Reply-to: ornstn@home.com
Sender: owner-dinosaur@usc.edu

At 04:25 PM 06/04/01 -0400, Al Fraser and Laurie Fletcher wrote:

Sclerotic rings are useless to support eyes under hydrostatic presure.
First, as stated, the compression is very slight.  Second, pressure is
isotropic - equal in all directions, so a structure behind an eye would not
support the eye as there would be no net force vector on the structure.

Since sclerotic rings are not precisely linked to diving but are linked to large eye size (in birds and ichthyosaurs), could they not simply help either to maintain the shape of the eyeball under normal circumstances, or to protect it against physical injury, or both?

-- Ronald I. Orenstein Phone: (905) 820-7886 International Wildlife Coalition Fax/Modem: (905) 569-0116 1825 Shady Creek Court Mississauga, Ontario, Canada L5L 3W2 mailto:ornstn@home.com

Follow-Ups:
- RE: Sclerotic rings
  - From: "Al Fraser and Laurie Fletcher" <alflaurf@abs.net>

References:
- Re: Sclerotic rings
  - From: "David Marjanovic" <david.marjanovic@gmx.at>
- RE: Sclerotic rings
  - From: "Al Fraser and Laurie Fletcher" <alflaurf@abs.net>

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