Lasik and observation

Post by **Airconvent** » Thu Jul 05, 2007 11:12 pm

mmm...i wonder if cataract operations are equally harmful as lasik as far as night observation is concerned? :roll:

Post by **weixing** » Thu Jul 05, 2007 11:42 pm

Hi,

mmm...i wonder if cataract operations are equally harmful as lasik as far as night observation is concerned?

I don't think anyone would go for cataract operation just for fun... so if you really need cataract operation, it's mean that you already can't see clearly already, so I don't think any more harm can be done. Anyway, just ask them whether they had SMC APO replacement lens lor... ha ha ha

Have a nice day.

Canopus Lim · Post by **Canopus Lim** » Fri Jul 06, 2007 1:32 am

"I don't think anyone would go for cataract operation just for fun... so if you really need cataract operation, it's mean that you already can't see clearly already, so I don't think any more harm can be done. Anyway, just ask them whether they had SMC APO replacement lens lor... ha ha ha"

Not only that, the cataract op needs to include "baffling" to improve the contrast.... from my dad's experience, his vision is still not good especially contrast detection (cannot tell blue and green apart well or any words that have low contrast with background). It is not a resolution problem. Since eye test seems to be resolution only giving black words on white background which is a high contrast.

rlow · Post by **rlow** » Fri Jul 06, 2007 9:43 am

Look around you.... Eye specialists are still wearing glasses!

Haha!... coming from the horse's mouth!

Post by **Airconvent** » Fri Jul 06, 2007 4:09 pm

my cataract is not getting better and its affecting my vision for reading.
thought I will go for the operation to correct it.
should there be any specific request I should make to ensure the eye is "recovered" for night observations? :roll:

kayheem · Post by **kayheem** » Fri Jul 06, 2007 10:30 pm

Airconvent wrote:my cataract is not getting better and its affecting my vision for reading.
thought I will go for the operation to correct it.
should there be any specific request I should make to ensure the eye is "recovered" for night observations? :roll:

How about a fully multi-coated triplet APO in an adjustable lens cell?

If possible, ask the surgeon to throw in a retractable dew shield!

Seriously, if I were you, I would not opt for the new-fangled multi-focal implants. When measurements are done to estimate the power of the implant, ask to be made emmetropic.

Post by **Airconvent** » Sat Jul 07, 2007 12:33 am

kayheem wrote:
Airconvent wrote:my cataract is not getting better and its affecting my vision for reading.
thought I will go for the operation to correct it.
should there be any specific request I should make to ensure the eye is "recovered" for night observations? :roll:
How about a fully multi-coated triplet APO in an adjustable lens cell?

If possible, ask the surgeon to throw in a retractable dew shield!

Seriously, if I were you, I would not opt for the new-fangled multi-focal implants. When measurements are done to estimate the power of the implant, ask to be made emmetropic.

thanks Kay Heem.
Can you explain why not the new-fangled multi-focal implant?
I would think the newer the tech, the better it will simulate a real eye lens?
what is emmetropic and how does this affect dim and averted vision required for astronomy. I was hoping it will fix the problem so that when rlow and cc tell me they see something there, I really see something there instead of blackness!

kayheem · Post by **kayheem** » Sat Jul 07, 2007 8:23 am

Hi Rich,

"Emmetropic" means properly corrected for distance without the need for additional glasses. You can actually opt for under-correction for those who do not want to wear reading glasses for near work. However, for astro, good unaided distance vision would be more suited for me so I can identify the dimmer stars when using my Rigel QuikFinder and then look into the eyepiece without removing glasses.

I have seen the brochure for the multifocal implant and the cross section resembles a fresnel screen. If you look into an eyepiece with a big AFOV, only the centre would be sharp. As you roll your eye down, the focal length of the implant changes. It is meant to act that way to enable us to read near in normal circumstances.

rlow · Post by **rlow** » Sun Jul 08, 2007 11:19 am

Can you explain why not the new-fangled multi-focal implant?
I would think the newer the tech, the better it will simulate a real eye lens?

Rich 1, its just like a new GOTO mount or a new software, you would not want to buy it until it is debugged, tried and tested. Surely you don't want your own eye to be used like a guinea pig, do you?

Post by **Airconvent** » Sun Jul 08, 2007 1:48 pm

ok...I do alot of reading and these days feel my eyes strained as I read.
So have to make sure the solution should be biaised towards everyday reading. Of course, its best if the solution is good for astronomy, so much the better. I am just wondering if I do go for the multi-focal solution, how "normal" will my vision look after the op and how affected will be my night vision for DSOs..