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Medical Forum / General / Vision / February 2005slab-off
I keep reading about this slab-off technique for eyeglasses. Is this a way for people with high dioptic differences in their eyes to be able to use prescription eyewear? This would be a welcome option to having to wear one contact lens. another proof that eyeglasses are not a solution but a great injury. >I keep reading about this slab-off technique for eyeglasses. Is this a > way for people with high dioptic differences in their eyes to be able > to use prescription eyewear? This would be a welcome option to having > to wear one contact lens. No. It is used to reduce the vertical diplopia at near induced by bifocals or multifocals with moderate differences (2 - 4 D) between the two eyes. If you have a large difference between the eyes and cannot tolerate single vision glasses, slab off will not help. If you were using bifocals or multifocals and experienced vertical diplopia while reading with them, slab off will help. Dr Judy Actually, I'm pretty sure Slab-off can be worked into single vision lenses as well. If you have a large difference between the two eyes then looking straight ahead of you and looking through the optical centers you should not have a prismatic effect. When you look down to read, you have moved a certain distance down from the optical center. This causes a prismatic effect because the prism is stronger with the stronger lens. The slab-off will match prismatic power of the other lens at the place of the lens that is used to read. Roland J. Izaac > >I keep reading about this slab-off technique for eyeglasses. Is this a > > way for people with high dioptic differences in their eyes to be able [quoted text clipped - 10 lines] > > Dr Judy the glasses I'm intending to use are progressives. My story is - cataract surgery in left eye which is now -1.75. The other eye is -6.25. I'm relying on a contact lens in the unoperated eye, but would love to be able to wear glasses. And, yes, I was infomed of the inability to wear glasses, but I kept hearing about 'slab-off' - which got my hopes up. > the glasses I'm intending to use are progressives. My story is - > cataract surgery in left eye which is now -1.75. The other eye is > -6.25. I'm relying on a contact lens in the unoperated eye, but would > love to be able to wear glasses. And, yes, I was infomed of the > inability to wear glasses, but I kept hearing about 'slab-off' - which > got my hopes up. Worth a try, check the warranty in case it doesn't work. The slab off will only deal with prismatic effects, not the minification/distortions/ abberations. You might have more success with a lined bi or trifocal instead of a progressive, again, due to peripheral effects. Dr Judy > Actually, I'm pretty sure Slab-off can be worked into single vision lenses > as well. If you have a large difference between the two eyes then looking [quoted text clipped - 8 lines] > > Roland J. Izaac Yes, slab off can be used on single vision glasses. However, people with moderate to large degree of refractive error will almost always tip their chins down to read with single vision lenses thus keeping the eye looking through the centre of the lens and avoiding both the prismatic effects and the distortions found in the lens periphery. If you are using the centre of the lens. the slab off adds no value. Dr Judy >> >I keep reading about this slab-off technique for eyeglasses. Is this a >> > way for people with high dioptic differences in their eyes to be able [quoted text clipped - 13 lines] >> >> Dr Judy |
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