Posts Tagged blindness

New Hope For Glaucoma

Posted by on Wednesday, 13 November, 2013
Cartoon about glaucoma

WIDER?

A LEADING CAUSE OF BLINDNESS

We’re going to talk about something new in glaucoma research. I don’t want to raise false hopes since we’re a long way from a cure – we’re not even quite sure what’s going on with glaucoma even though it’s the second leading cause of blindness.  But we know more. And we can do more about it.

GLAUCOMA

You may think glaucoma is what happens when the pressure in the front of your eye gets too high. That’s how it was generally understood until now.

Well many people who have glaucoma seem to have normal eye pressure. So now the thinking has shifted to the nerves of the eye. High ocular (eye) pressure isn’t a good thing. Definitely. So we want to keep that under control. If the pressure is too high, the nerves in the eye won’t get as much blood flow and, obviously, that’s bad. But, in glaucoma, even when the pressure is normal the nerves of the eye  deteriorate.

Why? This is the thing that’s not well understood. Maybe, in some people, those nerves are just defective in some way. Or maybe there’s something wrong with the way oxygen is transported to them. The interesting new direction that glaucoma research has taken is that in addition to keeping a handle on eye pressure, we’re also monitoring the condition of the optic nerve and developing stuff to protect it. Let’s look at both strategies, okay?

Pressure first.

Physicians do want to keep eye pressure down. If there are signs of glaucoma, they want to lower it. This is true even if it is already “normal”. This is often done with drops. Patients, unfortunately, aren’t very good at this stuff. They might take drops at first. But this is a lifelong commitment. Stuff happens. They forget. They get distracted. Whatever! And the eyes get worse.

The other thing is that it’s hard to get drops into your own eye. They land on the desk, on the cheek, on the Persian carpet. But not in the eye. That’s another problem. Historically, doctors find it very hard to get good results when they have to rely on their patients to get the job done.

Jerry Helzner, Senior Editor for Opthalmology Management, wrote about tiny implantable devices that can release medications very consistently to keep the pressure down. This is a really good idea. And it may save a lot of eyes.

Now nerves.

This is the new stuff. This is where we pull away from the focus only on pressure and start looking at how to protect the nerves too. In this interview from newschannel5.com, Dr. Jeffery Goldberg (Bascom Palmer Eye Institute, University of Miami) talks about a different kind of  implant. This one continuously delivers  a therapeutic dose of “neurotrophic growth factor” into the eye. What’s different here is that the aim is at keeping nerves alive.  It’s been tested on animals . Now it’s in human trials.

WANT TO KNOW MORE?

 There are several “versions” of glaucoma. Here’s a fine article from the New York Times that explains more about the human eye and about how glaucoma develops.

FINISHING UP

There’s a lot more testing to be done and”breakthroughs” do have so many ways of disappointing once they do get to human trials. But moving to protect the nerves as well as lower pressure in the eye could change things for a lot of people who might, otherwise, lose their sight. If this doesn’t work out, something else will. Before we completely understand what’s going on with glaucoma, we will have better treatments.

If you think you might have glaucoma, please get your butt down to the doctor. You’ll be fine. But get on this. Early diagnosis and treatment is important, okay?

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The drawing? That’s one of mine. If you’re a regular reader, you probably recognize those two. They show up often.

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Cure For Colorblindess

Posted by on Thursday, 18 March, 2010

No More Colorblind Monkeys

Ophthalmology: Colorblindness

MONOCHROME WORLD

You always wondered, didn’t you? What’s it like to be colorblind? That word – blind. Very dark and murky. But, if you’re colorblind, it’s colors you can’t see. It’s not like yer gonna wump into a wall or anything.

So is it such a bad thing?

The answer’s kinda yes and kinda no.

Some people are only a LITTLE color blind. They see a lot of colors. But not all of them. And some people (with monochromasy) are flat out colorless – like a “black and white” movie. Just black, white, and a bunch of grays.

Minochromasy isn’t common. But if you’ve got it, I wouldn’t plan a career around painting or photography or even police work (“Watch  for a guy wearing a blue cardigan”). And try not to take stuff like “Those SOCKS! What’re you, colorblind?” to heart.

Whether it’s a disability or just a disadvantage, it is one a those imperfections that makes life richer (one might even say, more colorful) if, sometimes, a little tougher.

A CURE

So. Guess what Jay Neitz (University of Washingon) just cured?

You’re GOOD!

That’s right. Fixed it right up. In monkeys. (Which, at least in your case, isn’t SO far removed.) And he seems optimistic that homo sapiens isn’t too far down this path as well as other vision disorders.

Good one, Dr Neitz.

ScienceAintSoBadRating = 9