Rapid, automatic measurement of the eye's wave aberration

A method of measuring a wavefront aberration of an eye, the method comprising:

• (a) taking image data from the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;
• (b) defining a plurality of search boxes in the image data by:
• (i) defining a central search box;
• (ii) defining a first set of search boxes relative to the central search box;
• (iii) locating centroids in the first set of search boxes;
• and
• (iv) defining successive sets of search boxes, each successive set defined in accordance with locations of centroids in a previous set;
• (c) determining the positions of the spots by:
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (d) calculating the wavefront aberration in accordance with the positions of the spots.

A method of measuring a wavefront aberration of an eye, the method comprising:

• (a) taking image data from the eye while correcting for a spatial inhomogeneity in a retina of the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;
• (b) defining a plurality of search boxes in the image data;
• (c) determining the positions of the spots by
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (d) calculating the wavefront aberration in accordance with the positions of the spots.

A method of measuring a wavefront aberration of an eye, the method comprising:

• (a) taking image data from a plurality of locations in the eye, the image data comprising a plurality of spots corresponding to the plurality of locations and having positions determined by the wavefront aberration, the data from the plurality of locations in the eye being taken by scanning light into the eye such that the plurality of spots are separated in time;
• (b) defining a plurality of search boxes in the image data;
• (c) determining the positions of the spots by
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size, the search box of reduced size being clipped to fit entirely within the search box which is replaced;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (d) calculating the wavefront aberration in accordance with the positions of the spots.

A device for measuring a wavefront aberration of an eye, the device comprising:

• image data taking means for taking image data from the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;
• and
• data processing means, receiving the image data, for:
• (a) defining a plurality of search boxes in the image data;
• (b) determining the positions of the spots by:
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size, the search box of reduced size being clipped to fit entirely within the search box which is replaced;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (c) calculating the wavefront aberration in accordance with the positions of the spots.

A device for measuring a wavefront aberration of an eye, the device comprising:

• image data taking means for taking image data from the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;
• and
• data processing means, receiving the image data, for:
• (a) defining a plurality of search boxes in the image data by:
• (i) defining a central search box;
• (ii) defining a first set of search boxes relative to the central search box;
• (iii) locating centroids in the first set of search boxes;
• and
• (iv) defining successive sets of search boxes, each successive set defined in accordance with locations of centroids in a previous set;
• (b) determining the positions of the spots by:
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (c) calculating the wavefront aberration in accordance with the positions of the spots.

A device for measuring a wavefront aberration of an eye, the device comprising:

• image data taking means for taking image data from the eye while correcting for a spatial inhomogeneity in a retina of the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;
• and
• data processing means, receiving the image data, for:
• (a) defining a plurality of search boxes in the image data;
• (b) determining the positions of the spots by
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (c) calculating the wavefront aberration in accordance with the positions of the spots.

A device for measuring a wavefront aberration of an eye, the method comprising:

• image data taking means for taking image data from a plurality of locations in the eye, the image data comprising a plurality of spots corresponding to the plurality of locations and having positions determined by the wavefront aberration, the image data taking means comprising a scanner, the data from the plurality of locations in the eye being taken by scanning light into the eye with the scanner such that the plurality of spots are separated in time;
• and
• data processing means, receiving the image data, for:
• (a) defining a plurality of search boxes in the image data;
• (b) determining the positions of the spots by
• (i) locating a centroid in each of the search boxes;
• (ii) replacing each of the search boxes with a search box of reduced size, the search box of reduced size being clipped to fit entirely within the search box which is replaced;
• (iii) locating the centroid in each of the search boxes of reduced size;
• and
• (iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size;
• and
• (c) calculating the wavefront aberration in accordance with the positions of the spots.