PRK recovery – week 4.

The last (two) weeks have been up and down. The nurse surprised me during my last exam when the eye I thought was my fuzzy one was actually better than my ‘good’ eye. Expect lots of that. An eye will be good up close for a couple of days, then distance is better. What is awesome is terrible 48 hours later.

I ran out of steroid drops on the holiday first thing and only got drops in one eye. KU Eye Med (the clinic I had the procedure done at) was apparently closed. It took over 24 hours to get refill drops. It could have just been in my head but my vision appeared to regress significantly. I got the drops back in mid-afternoon and throughout the evening my vision appeared to improve. Distance is still pretty fuzzy but it’s doable.  The most obnoxious part – one eye is sharper than the other at times, right? Prepare for headaches as your brain is angered at the processing changes.

There was a point today when I was driving and I couldn’t read the text on signs until they were closer than I would like where I began to wonder if something was wrong. Then I remembered my vision immediately after the surgery. Hold onto that memory. You will have nearly that level of clarity again. Focus will come and go until the outer layer is fully healed, nothing is wrong at this point.

Spacewalk cluster with self-signed certs.

Spacewalk has a lot of options. There’s a lot of good docs out there by the default docs are somewhat hard to follow. This post is intended to be a framework to create a self-signed CA (or use a third-party CA and skip the self-signed portion), and then apply the root CA cert to the entire cluster simplifying configuration. If you go self-signed, you’re definitely going to want to create the CA certs.

For the purpose of this post, we’re making a master and slave configuration with proxies.

Wewt. We have our signing key. Time to sign some certs. For this post we’re going to have 7 servers:
master.server.com – the spacewalk master server.
a.slave.server.com
b.slave.server.com
c.slave.server.com – These are the spacewalk portal/slave servers. These will pull packages and channels from the master server.
proxy.a.slave.server.com
proxy.b.slave.server.com
proxy.c.slave.server.com – These are the Spacewalk proxies. Each of these sits in front of the Spacewalk slave and caches packages.

A quick note on how this configuration works. The master server pulls in packages and assigns them to channels (repos.) The slave servers sync content with the master. Errata is assigned to the slaves and tied to channels, and packages in those channels. You can run servers directly against the slaves or master, but it can be tipped over under heavy load. The proxies use Squid to cache packages offloading much of the work but otherwise are just relays.

On relays, there’s two basic forms of package management. OSAD, and RHN. OSAD uses a HTTP keepalive sessions from each client to the SW server to allow for pushes. It’s very handy, but it can be a pain to maintain with a large number of clients. RHN is the other method. Each server will check into the proxy/slave/master every 60 minutes by default and see if there are commands queued.

Back to the build. We’re going to make some client certs, then sign them.

Now we have ssl certs for each of the servers in this cluster. Copy them over to each server. The structure of the directories on each server will need to be this:

This imports the cert into the Spacewalk application. Lets create the RPM for the CA, and each server:

Substitute proxy.c.slave for each of the hostnames listed previously. There will be 7 total here. Validate that each cert matches:

If there are any problems, recreate, or resign the certs.

Now that we have the actual SSL certs, lets start applying them. Spacewalk has tools that creates RPM’s for the CA (/root/RHN-ORG-TRUSTED-SSL-CERT) and also the certs.

There’s an additional step on the slaves, and the master:

master
a.slave
b.slave
c.slave

On the proxies:

There’s some basic management needed next and good guides out there for that stage of things. At a minimum, you need to go into the slave servers and add the proxies, grant them access to any wanted channels and make sure that they have a provisioning entitlement.

On each client to connect to these servers:

This took a lot of piecing things together. It’s not really complex and there’s some good guides out there but it’s hard to get everything working from end to end.

PRK recovery day 8-14

There was a brief window between days 8 and 11 where I had ghosting (a double-image) as the left eye caught up to the right one in terms of being able to see. With that came quite the headache as my brain tried to process out-of-sync information. That cleared up fairly quickly.

Not a lot of changes here. My left eye has gradually caught up with my right one. I still see ghosting in my right eye a little but but the haze is completely gone. Down to a few drops of the steroids a day along with tons of drops. (Did I mention to get them at Costco? They’re a steal there.)

Testing today the eye has been completely healed. I can now take showers again. That will probably be the most enjoyable shower I have ever had. The doctor said one thing that was interesting – the surface of the eye is the holdup for clarity. Even though the flap has closed it’s still rough causing a slight bump. They noted that I was ahead of the healing curve but that I was sitting at 20/20, and 20/15 respectively and things have not cleared up yet. I attribute the accelerated healing to luck, and religiously taking the drops on-time.

No scarring, no corneal haze. Pretty lucky all things considered. My vision is better than it has been for years, even with correction. If you have astigmatism… get PRK. It’s worth it. If you’re on the fence on if PRK is worth it even with the suck of the first week… it is. Even with slightly fuzzy vision.

Other things that are interesting, my next checkup is 6 weeks out and it will likely be my last. At this stage I’m not done with care, I still have 4x daily steroid drops and I have to wear shades outside. There’s a risk of scarring if you don’t. I read a lot of FUD about what the steroids do. In case anyone is reading this and has seen the same – they promote healing, not slow it down. There’s a nice bonus where they reduce inflammation – allowing you to see better against light during the painful days.

I’ll update weekly from here on out, but won’t post daily unless something big happens. Now that I can see again I’ll have to go back and proof-read earlier posts 🙂

Android MTP mounting on OSX

Mounting Android devices on OSX can be a pain. There are commercial options that make it easy, but it’s also not horribly difficult with the help of some good software packages out there:

That’s that for the install. Test it quick to make sure it works:

You should see your phone pop up. If it doesn’t, you have a bad USB cable, your phone isn’t configured to allow connections, you have a power only cable, etc. Also, make sure that your phone is set to MTP, and that the computer is trusted. Once that’s done, you should be set!

PRK prep

As one of the last posts in this series I wanted to highlight a couple of things that I’d recommend to prepare.

First, a tub. Make sure you can either not bathe for a week without issue or that you can take a bath somewhere. You’re not going to be able to take a shower for a minimum of a week safely – there’s too much risk of infection until the layer of skin on the eye grows back.

Second, a place where you can go that’s absolutely dark. Again, a bathtub is a very nice way to relax during the day or two of light sensitivity you might experience.

You’ll need lubricant. My doctor gave me a days supply of drops, but you’re going to want quite a few more. I used 50 of these in about 6 days. Go for 100, you will use them. If you don’t have a Costco membership this is the lowest price per unit I’ve found. The sticks are nice because you can stuff a few in your pockets if you’re going to be away from home for a while and each stick can be used in both eyes 2 or 3 times.

 

If there’s a Costco in your area and you are a member you can get them slightly cheaper but it requires a membership:

http://www.costco.com/Refresh-Plus%C2%AE,-100-Single-Use-Containers.product.11318658.html

Even after it’s no longer a requirement for my surgery I’ll keep buying this brand. I hate putting stuff in my eyes and the squeeze trigger on these makes it so much easier. There’s no surprise when the drop will land.

Food – this seems simple but if you skip this step and don’t have someone around that can cook/order food for you on the light sensitive days you’re probably going to go hungry rather than deal with the pain. Stock up on foods with vitamin C and load up immediately before and during your recovery. It helps.

Safety goggles/sunglasses. I’m into scuba so I actually used a scuba mask to risk a partial shower after most of the healing was done. You absolutely should not risk getting water in your eyes. Be extremely careful, and only attempt this with something you know for sure won’t leak.

Entertainment. Even reading paper books is going to be tricky, and you’re not going to be watching TV/movies through the process – just too hard. Stock up on audiobooks, music, TV shows that you can just listen to, etc.

Work. I was able to work the next two days after but it was hard. Make sure that you plan for at least a week of not having to be in the office. Your experience might vary drastically but keep your options open.

Sleep aids. You might look at melatonin, or other chemicals to help you get to sleep. Trust me. It works it’s effective, and there will probably be times you need the help. Falling asleep when your eyes are this kind of irritated can be difficult.

PRK recovery day 7

I’ve had a bit of trouble sleeping the last couple of nights since my contacts came out. It’s not a lot, but it is noticeable at times. It doesn’t feel like anything is in my eye at this point but it does feel rough when I blink. That’s somewhat to be expected. It’s much less than yesterday. I don’t know how much is left to heal but I woke up with vision in my left eye equal to that in my right as of Sunday. I’m starting to get brief glimpses (usually immediately after using drops) where I can see with a clarity I have not had since day 1.

The haze in my left eye is almost completely gone and it’s being replaced by a slightly fuzzy blur. I can see sharpness again in my right eye but getting it to focus takes a little work. If progress continues on this rate I expect that I’ll have as good as vision as I had with glasses by this weekend.

One of my friends asked about halos as a lot of the earlier surgeries had issues with them. That apparently has been mostly removed as a problem when they started mapping the eye itself. At this stage I can notice a little halo. When I wore glasses earlier (astigmatism)  there was more halo that exists in either eye at this point. LEDs across the room have a little blur but as of lat night it’s almost clear.

I probably will just have short blurbs from here on out, unless something unexpected happens. I think I’d pinpoint day 5 (Sunday) or day 6 as the big turning points in recovery. Even if my vision doesn’t improve from here, it was absolutely worth it and I would undergo the procedure again in a second.

PRK Recovery Day 6

Today the contacts came out. I figured it would be a slightly painful experience. Not so. They numbed my eyes again and pulled the contacts out. They’re pretty much like regular contacts. She used tweezers which I figured would be hard to hold still for but you don’t see ’em.

I had 3 rounds of vision testing. Before the contacts came out I tested at 20/30, and 20/25 respectively. Using the pinhole test I was easily able to get 20/20. When they contacts were removed I was still able to see 20/30, and 20/25 letters but I missed a couple more. My vision did get worse, but barely.

I did still have a hole in the skin but it was tiny so they opted to keep the contacts out – I just have to use the steroid and antibacterial drops a bit more.

Very pleased with the progress so far. I can almost see well enough to read standard font on a computer screen. It is no longer 84px 🙂