More Lens questions

[laguire]

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(My 1st post, sorry about the length). I read a thread earlier in June about lenses and am about to buy some myself. I had some additional questions - my program's supplier is pushing the ocular lenses.
1. So I've been comparing the quoted mags and field of views on the ocular vs volk. I noticed the ocular cr-39 90 has a higher FOV but essentially a similar mag - does that really mean the ocular cr-39 should produce a similar size image but a wider field? (is there more to it than these numbers say?)I'm assuming the distortion at the periphery would be higher?
2. I know there is strong volk brand name loyalty, but is there really a difference in image quality? (I heard the cr-39's may scratch more, but ocular also makes glass now). My chief uses the oculars and is ok with them, anyone else have input in comparing the two?
3. I also noticed in general that the 78D have higher mag and field of view than 90D? Why would anyone use a 90 if you could use a 78? (could you get away with buying a 78 and not a 90?) Does a small pupil prevent you from seeing anything on the 78?
4. The volk line of "super" lenses - what is the trade-off? higher mag and higher fov, is the main trade-off (other than price) distortion in the periphery?
Thanks in advance for all of the help!

 

[Retinamark]

3. I also noticed in general that the 78D have higher mag and field of view than 90D? Why would anyone use a 90 if you could use a 78? (could you get away with buying a 78 and not a 90?) Does a small pupil prevent you from seeing anything on the 78? !

Yes, it is more difficult to see through a small pupil with a 78. The FOV with a 78 isn't as good as the Super Field though.

4. The volk line of "super" lenses - what is the trade-off? higher mag and higher fov, is the main trade-off (other than price) distortion in the periphery?
Thanks in advance for all of the help!

The main trade off I think is more reflections, which take a bit of practice to get used to.

You can be a great ophthalmologist no matter which lenses you buy. Best option is to borrow some for a week & try them out & see what you prefer. Some people prefer high mag views, others prefer to stand back & get the overall view

 

[Andrew_Doan]

I didn't appreciate the view with a 60D or 78D when I first started out. I recommend getting the 20D and 90D first, then decide which lenses you would like to add to your set later. You'll need a 90D to exam undilated eyes during your glaucoma rotation.

Good luck!

 

[Richard_Hom]

Something else to consider is working distance. The 90D lets you have greater work distance than the other lenses.

The 90d is also small and light weight.

Richard
on a Jornada

 

[Retinamark]

I didn't appreciate the view with a 60D or 78D when I first started out. I recommend getting the 20D and 90D first, then decide which lenses you would like to add to your set later. You'll need a 90D to exam undilated eyes during your glaucoma rotation.

Good luck!

That's definitely true - it takes a bit of practice to get good with the 60. It's really worth persisting though - I love my 60 😍

 

[Andrew_Doan]

That's definitely true - it takes a bit of practice to get good with the 60. It's really worth persisting though - I love my 60 😍

I agree, and I'm purchasing a 60D this year! 😉

 

[laguire]

Thanks for all the input, much appreciated! I tried my chief's ocular 90 and 60 and they seem fine (and they have a quoted higher field of view), so I'm getting those (I know all the volk loyalists are cringing), but I'm sticking with the higher mag of the volk 20 (3.13 vs the ocular 20 at 2.97). I know it's kind of odd to mix and match, but we'll see how it goes.