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Optics Block 7 > Monochomatic Aberrations Of The Human Eye > Flashcards

Monochomatic Aberrations Of The Human Eye Flashcards

1
Q

What does defocus depend in

A

Pupil size and Rx

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2
Q

How much defocus can make a big difference

A

0.25 microns

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3
Q

What does trefoil look like.

A

3 POINTS

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4
Q

Is trefoil bad

A

Not as bad as others, a lot of light still focused in the center

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5
Q

Coma

A

Off axis defocus

  • seen in keratoconus
  • thin corean after LASIK
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6
Q

Spherical aberrations

A

Not focusing on same spot

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7
Q

E in spherical aberrations

A

Faint but can still see E, negative would be even better

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8
Q

What is the aberration that does not have a nonzero value

A

Spherical

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9
Q

A population average of the magnitude of zernike terms

A

Shows that higher order aberrations are dominated by 3rd order and spherical aberrations

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10
Q

Aberrations and pupil size

A

Aberrations reduced with reduced pupil size

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11
Q

Dynamic changes in the wave aberrations are caused by

A

Accommodation
Eye movement
Eye translation
Tear film

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12
Q

What is LASIK mainly good for

A

Defocus and cyl

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13
Q

Primary sources of scattered light

A

Cornea
Iris/sclera
Lens
Fundus

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14
Q

Actual subjective appearance of straylight: a pattern of very fine streaks, not at all like the circularly uniform scattering pattern of particles of approximate wavelnegth size

A

Ciliary corona

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15
Q

Wavefront for LASIK

A

Central flat area and curvature in peripheral

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16
Q

Post LASIK wavefront

A

Spherical looking

17
Q

Change in aberration over age

A

Not a big change over age

18
Q

How will having a smaller optical zone change the depth of incision

A

Won’t need to go as deep with a smaller optica zone

19
Q

For an 8mm pupil, how many microns do you need to -1.00D in LASIK

A

1

20
Q

For a 2mm pupil, how many microns do you need to get to -1.00D?

A

0.12microns

21
Q

Problems with a small optical zone

A

Probably worse vision, especially at night

Optics Block 7 (6 decks)

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