OzEclipse
07-11-2015, 12:17 PM
On another message in this forum, this message was posted : -
I have found a probable solution to this age old problem.
I had my eye test 3 weeks ago. I asked the optometrist about whether I could order a circular lens of a specified diameter with anti reflection coatings and just the astigmatism script in the lens. He confirmed that I could do that but that the lens cutting machine needs a profile to follow to cut the lens outline. I can't just specify a diameter. So he said that if I give them the holder I am going to use to mount the lens with the recess, they can cut the lens or lenses to match. My astigmatism is the result of an eye accident 20 years ago and the astigmatism part of the script doesn't seem to change over long periods of time So I am thinking that this might be a worthwhile exercise. If yours changes regularly then this is going to cost a bit more to replace the lens each couple of years. Would also suggest that you'll need one per eyepiece. If you observe alone, the approach will be different to than if you observe with people with good eyes.
So the next step is to measure up all my eyepieces and design some correction lens holders that fit over the eyepieces. I think I'll try to standardize the lens recess to one or two sizes so I can just send in one holder but have several lenses made. At first I was going to ask them to mark the edge to orient the lens but then realized that it's easy and quick to rotate the whole eyepiece until the image becomes sharp.
Joe
I have found a probable solution to this age old problem.
I had my eye test 3 weeks ago. I asked the optometrist about whether I could order a circular lens of a specified diameter with anti reflection coatings and just the astigmatism script in the lens. He confirmed that I could do that but that the lens cutting machine needs a profile to follow to cut the lens outline. I can't just specify a diameter. So he said that if I give them the holder I am going to use to mount the lens with the recess, they can cut the lens or lenses to match. My astigmatism is the result of an eye accident 20 years ago and the astigmatism part of the script doesn't seem to change over long periods of time So I am thinking that this might be a worthwhile exercise. If yours changes regularly then this is going to cost a bit more to replace the lens each couple of years. Would also suggest that you'll need one per eyepiece. If you observe alone, the approach will be different to than if you observe with people with good eyes.
So the next step is to measure up all my eyepieces and design some correction lens holders that fit over the eyepieces. I think I'll try to standardize the lens recess to one or two sizes so I can just send in one holder but have several lenses made. At first I was going to ask them to mark the edge to orient the lens but then realized that it's easy and quick to rotate the whole eyepiece until the image becomes sharp.
Joe