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sdingeldein

Member Since 04 May 2003
Offline Last Active Mar 16 2014 04:32 PM
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Posts I've Made

In Topic: WTB Sea & Sea 12mm Nikonos Wide Angle

26 January 2013 - 04:54 AM

Have a 16 mm screw on wide angle Sea and Sea, but not 12 mm lens.

In Topic: WTB - Ikelite housing for Nikon D300

20 January 2013 - 08:48 AM

I sent a reply via PM but didn't hear back. I still have a housing that you may be interested in.

In Topic: Frogfish in Azure Vase

01 April 2012 - 01:06 PM

Very, very nice.

In Topic: Strange Nudibranch behavior

01 April 2012 - 02:48 AM

Hi guys,

Found these two colorful fellows in Alor, Indonesia. Do you know what they are doing? Cannot seem to figure it out...

[attachment=19239:wetp.JPG]

Cheers

Daniel


I'm assuming that the orange one is the second one. If so, it may be "trailing": "Also known as queueing or tail-gating, all species of the chromodorid genus Risbecia exhibit this behaviour where they seem to play "follow the leader". Perhaps its a behaviour which has evolved amongst relatively uncommon animals to ensure they find each other for mating. When tailing, one animal appears to follow the mucous trail of the other until they actually make contact. Then the following animal, as can be seen in thse photos, keeps contact by touching the 'tail' of the leader. Sometimes 3 or 4 animals can be seen together."

I've seen it in a Caribbean slug

Fact Sheet - Trailing

In Topic: New Alternative Eye op done as laser eye surgery not strong enough

27 February 2012 - 03:55 PM

I hate to throw a bit of cold water on the enthusiasm, but I am a cataract surgeon and there are a few things to consider before going this route (cataract surgery if one has a cataract and clear lens extraction if one doesn't have a cataract).

First it not (at least in the US) a silicone versus synthetic. There are silicone IOLs and PMMA IOLs, typically an acrylic IOL that is foldable. Multifocal IOLS are available in acrylic lenses and have been for several years. The different IOLs do their "multifocal" work in different ways, but most of them work on a "robbing Peter to pay Paul" optical principle, typically some form of diffraction or different powers in the lens.

Second, not all is hunky dory with multifocal lenses due to the fact that none (except claimed by the Crystal lens) work the way your eyes did when you were young. The diffractive and refractive IOLs tend to produce softer vision and there are problems potentially with halos at night. Occasionally, rarely, a patient wants one removed because they do not like the quality of vision. Monofocal lenses do not give you up close and distance vision but arguably give one a better quality of vision. And the success rate of multifocals varies. I tell patients they have about an 80% chance of not needing glasses most of the time, but that most will need glasses especially for small print.

Lastly, there is risk to the surgery, including a less than ideal outcome, infection (1:1000/3000) and cataract surgery increases the risk of having a retinal detachment, especially in a high myope (nearsighted).

Yes, LASIK can be done to "touch up" a less than ideal result.