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What is it? |
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Aberrometry is a technique to measure aberrations with the help of an instrument
called aberrometer. An aberration is a vision defect that occurs when light rays are
improperly bent (refracted) in the eye. An aberration may occur because of a flow in the
structure of the eye. There are lower order aberrations sphere and cylinder and there are
higher order aberrations such as coma, trefoil and spherical aberrations. |
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What is it done for? |
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It is done as a pre- screening test before lasik surgery for better refractive accuracy. |
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How is it done? |
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Aberrometer use wavefronts to objectively measure the overall refractive power of
the eye, they do this by mapping how light rays travel through the eye and by providing
maps using colour gradients to represent magnitudes of the refractive errors which
enables ophthalmologists to locate and possibly correct even obscure imperfections that
cause vision defects. |
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What are the benefits? |
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a. Wavefront guided ablations reduce preoperative aberrations in some eye.
b.Customized procedures induce fewer aberrations.
c.Better refractive accuracy with aberrometer. |
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What are the limitations? |
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The biggest challenge for Aberrometry is patients eye occasionally accommodate
during the process. If a wavelength reading is more myopic than the manifest refraction
especially in a young patient, then it is likely the eye was accommodating. Wavefront
analysis adds sometime to the preoperative testing.
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How much time is taken? |
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The time taken for both eyes is 10 to 15 minutes.
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When does it have to be repeated? |
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As per doctors advise. |
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What are other alternative tests? |
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Wavefront guided aberrations test. |
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How much does it cost? |
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The cost may vary from one hospital to the other. |
