[48616] in Discussion of MIT-community interests
Lasik Eyesight Options
daemon@ATHENA.MIT.EDU (Lasik Care)
Thu Aug 6 06:39:34 2015
Date: Thu, 6 Aug 2015 06:39:13 -0400
To: mit-talk-mtg@charon.mit.edu
From: Lasik Care <lasikcare@nente.eu>
Reply-to: Lasik Care <lasikcare@nente.eu>
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Lasik Eyesight Options
external optics may have the greater influence, and in other patients, the internal optics may predominate. I
mportantly, qz the axes and magnitudes of external and internal astd g2kqz igmatism do not necessarily coincide, but it is the
combination of the two that by definition determines the overall optics of thed 2kqz e eye.
When treating a patient with preexisting astigmatism qz t, most wavefront-guasers are designed to treat r
egular astigmatis kqz m as determined externally by corneal topography. In patients who have an element of internally
induced astigmatism, therefore, th qz t wavefront-guided astigmatism correction may leave regular astigmatism behind
(a cross-cylinder effect). If the patient has preexised 2kqz ting irregular astigmatism, wavefront-guided approaches may
leave both regular and irregular astigmatism behind. This can result in less-than-optimal visual acuity compared
with a wavefroed g2kqz nt-guided approach combined with vector planning, d fg2kqz as shown in aThus, vecto kqz r planni
ng offers a better alignment between corneal astigmatism and laser treatment, and leaves less regular astigmatism beh
ind on the cornea, which is advantageous whether irregular asti qz tgmatism coexists or not.
The "leftover" astigmatism after a purely surface-guided laser correction can be calculated beforehand, and is called
ocular residual astigmat kqz tismORA is ad g2kqz calculation of astigmatism due to the noncorneal surface (internal) optics.
The purely refraction-based approach represented by wavefront analysis actually conflicts wed 2kqz ith corneal surgical experie
The pathway to "super vision" thus may require a more customized approach to cornead g2kqz l astigmatism than is usually attempt
ed, and any remaining astigmatism ought to be regular kqz (as opphis was confirmed by thtudy mentioned
above, which found a greater red 2kqz uction in corneal astigmas directed towards the exposed internal surface or r
d apparatus f kqz or m fg2kqz odifying the curvature of a live cornea via use of an excimer laser. The live cornea has a thin layer remo
ved therefrom, leaving an exposed internal surface thereon. Then, either the surface or thined 2kqz layer is exposed to the laser b
eam along a predetermined pattern to ablate desired pored 2kqz tions. The thin layer is then replaced onto the surface. Ablating a
central area of the surface or thin layer makes the cornea less curved qz t, while ablating an annular area spaced from the cent
er of the surface or kqz layer makes t movable mirror or a movable fiber optic cable through which the laser beam i
The patents related to so-called broadd g2kqz -ies were granted to US companies including Visx and Summi
t during based on the fundamental US patehich claimed the use of UV laser for the ablation
of organic tissues granted a U new technology ed 2kqz using a flying-spot for
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external optics may have the greater influence, and in other patients, the internal optics may predominate. I
mportantly, kw the axes and magnitudes of external and internal astd t8hkw igmatism do not necessarily coincide, but it is the
combination of the two that by definition determines the overall optics of thed 8hkw e eye.
When treating a patient with preexisting astigmatism kw t, most wavefront-guasers are designed to treat r
egular astigmatis hkw m as determined externally by corneal topography. In patients who have an element of internally
induced astigmatism, therefore, th kw t wavefront-guided astigmatism correction may leave regular astigmatism behind
(a cross-cylinder effect). If the patient has preexised 8hkw ting irregular astigmatism, wavefront-guided approaches may
leave both regular and irregular astigmatism behind. This can result in less-than-optimal visual acuity compared
with a wavefroed t8hkw nt-guided approach combined with vector planning, d at8hkw as shown in aThus, vecto hkw r planni
ng offers a better alignment between corneal astigmatism and laser treatment, and leaves less regular astigmatism beh
ind on the cornea, which is advantageous whether irregular asti kw tgmatism coexists or not.
The "leftover" astigmatism after a purely surface-guided laser correction can be calculated beforehand, and is called
ocular residual astigmat hkw tismORA is ad t8hkw calculation of astigmatism due to the noncorneal surface (internal) optics.
The purely refraction-based approach represented by wavefront analysis actually conflicts wed 8hkw ith corneal surgical experie
The pathway to "super vision" thus may require a more customized approach to cornead t8hkw l astigmatism than is usually attempt
ed, and any remaining astigmatism ought to be regular hkw (as opphis was confirmed by thtudy mentioned
above, which found a greater red 8hkw uction in corneal astigmas directed towards the exposed internal surface or r
d apparatus f hkw or m at8hkw odifying the curvature of a live cornea via use of an excimer laser. The live cornea has a thin layer remo
ved therefrom, leaving an exposed internal surface thereon. Then, either the surface or thined 8hkw layer is exposed to the laser b
eam along a predetermined pattern to ablate desired pored 8hkw tions. The thin layer is then replaced onto the surface. Ablating a
central area of the surface or thin layer makes the cornea less curved kw t, while ablating an annular area spaced from the cent
er of the surface or hkw layer makes t movable mirror or a movable fiber optic cable through which the laser beam i
The patents related to so-called broadd t8hkw -ies were granted to US companies including Visx and Summi
t during based on the fundamental US patehich claimed the use of UV laser for the ablation
of organic tissues granted a U new technology ed 8hkw using a flying-spot for
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