Talk:Lens (vertebrate anatomy)

Pole?

This showed up recently at Cardinal point (optics)#Surface_vertices but I find no mention of it here at Lens (anatomy):

In anatomy, the surface vertices of the eye's lens are called the anterior and posterior poles of the lens[1].

Is it accurate? Is it important information that should be included here as well? Ewlyahoocom 14:32, 7 March 2006 (UTC)

Not that important. With small rodent and fish lenses they are closer to spherical so the most anterior and posterior points are similar to the earths poles. In flatter lenses like humans they are often referred to as the anterior and posterior surfaces. But why get technical at all. Just call them front and back to make it clearer to the average reader. Tgru001 (talk) 10:58, 14 February 2023 (UTC)

That isn't the only thing missing from this article. I think that this is a topic that deserves much more detail. (64.59.249.107 05:45, 22 March 2006 (UTC))

I've put lots more in, including references. Let me know areas you would still like expanded. Tgru001 (talk) 10:59, 14 February 2023 (UTC)

Diagram?

As I was reading this text I noticed an error on the second diagram. The light's path is incorrect. Do correct me if I am wrong? Miapowell 00:05, 5 December 2006 (UTC)

Front, back, and also there are internal gradients in the lens. While the first diagram is widely used to explain short and long focus in a simple way, the more correct diagrams with cross over points in the lens in now inserted later in the article. Tgru001 (talk) 11:01, 14 February 2023 (UTC)

They're both wrong. Refraction happens on front and back surfaces. -lysdexia 22:43, 12 March 2007 (UTC)

Birefringence?

I have heard that the lens has birefringent characteristics. Does this introduce multifocii, or at least dual focii, into the optics? If so does this enhance the visual ability and/or the ability of the eye to maintain its focal control? Sapoty 06:25, 7 July 2007 (UTC)

No evidence for this having an advantage, just a side effect of the way the lens fibers are organized. Tgru001 (talk) 11:03, 14 February 2023 (UTC)

8/2007 rework

I rewrote some paragraphs, added some info on structure, function, and disease. However, this article still needs more info on development and supply of the lens with nourishment.Jasu 16:35, 21 August 2007 (UTC)

I've added a bit but it needs lots more, a special section. I'll try and do lens nutrition in more detail soon. Tgru001 (talk) 11:04, 14 February 2023 (UTC)

Error in accommodation

As it stands, the article states that the ciliary muscle contracts to 'stretch the lens' to enable it to reduce its power. Being a radial muscle, it in fact relaxes to increase zonular tension, which allows the lens return to its resting state. I have edited the page to reflect this. Fillup (talk) 00:12, 28 December 2009 (UTC)

Hi. Its a bit of a combo muscle radial/sphincter like. I've modified slightly more to be a bit more correct. Tgru001 (talk) 11:06, 14 February 2023 (UTC)

Please clarify

Hello.

I placed a "clarification needed" template at the end of the following sentence:

"Inside the capsule much thinner lens fibers form the bulk of the lens."

The reason is that it seems contradictory with the previous sentences. Is it really "inside the capsule" or should it rather say "in the interior of the lens" or something like that?

I have no knowledge of this topic, so there's probably no real reason for my confusion and everything is ok.

Thank you. AwerDiWeGo (talk) 18:35, 19 August 2024 (UTC)

I'm just realizing that I probably misunderstood the meaning of the word "capsule". English is a foreign language to me.

I guess I should remove the "clarification needed" template. I'll wait a little and, if no one answers, then I'll remove the template. AwerDiWeGo (talk) 19:23, 19 August 2024 (UTC)

Difficult sentence

Should the following sentence be rewritten? If the answer is yes, I don't have the knowledge to do it myself.

"As ions, nutrients, and liquid enter the lens from the aqueous humor, Na+/K+-ATPase pumps in the lens epithelial cells pump ions out of the lens to maintain appropriate lens osmotic concentration and volume, with equatorially positioned lens epithelium cells contributing most to this current." AwerDiWeGo (talk) 21:19, 20 August 2024 (UTC)