US 12,754,441 B2Granted

Tilt and offset correction for scleral and normal contact lenses

AssigneeWaveFront Dynamics, Inc.

InventorsDaniel R. Neal, Xifeng Xiao

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Abstract

A method for correcting aberrations of a patient's eye with a customized contact lens, including determining an optimal XY location and an optimal angular orientation, a, for placing correction optics on the customized contact lens by using an optical instrument to measure XY offsets (ΔX, ΔY) and X, Y, Z tilt angles, (θx, θy, α), respectively, of a predicate contact lens while disposed on the patient's eye is disclosed. The predicate contact lens and the customized contact lens can be a scleral contact lens or a normal contact lens. The optical instrument can comprise a wavefront aberrometer and/or a corneal topographer. The correction optics include a wavefront-customized contact lens with a built-in, optimized wavefront-guided correction patch. The predicate contact lens can include three or more fiducial marks inside of the pupil, which can be used to determine the XY center of the predicate contact lens when placed on the patient's eye.

Claims14

Dependent claims

A method for determining an offset position and a rotation angle of a wavefront-customized correction patch for a wavefront-customized contact lens, the method comprising:

placing a Contact Lens (CL) on a patient's eye;
measuring an offset position and a rotation angle of the contact lens relative to a pupil of the patient's eye;
and
calculating a real center, (Xc, Yc), of the contact lens by:
(1) providing a Radius of Curvature=R, Sagittal height=S0, and Diameter=d of the contact lens;
(2) measuring, with an optical instrument, a pair of XY coordinates (XV, YV) of a Corneal Vertex Normal by using a Corneal Topography (CT) and/or a visual Eye Imaging (EI) technique;
(3) determining a virtual center (Xe, Ye) of the CL by fitting an edge of the contact lens to a circle or ellipse by using the diameter, d;
(4) calculating X- and Y-tilt angles (θxd, θy) by using equations (7) and (8), as follows:
θ
x
=
tan
-
1
⁢
X
v
-
X
e
R
(
Eq
.
7
)
θ
x
=
tan
-
1
⁢
X
v
-
X
e
R
.
(
Eq
.
8
)
and
(5) calculating the real center (Xc, Yc) of the contact lens by using equations (9) and (10), as follows:
X
c
=
X
e
+
S
0
⁢
sin
⁢
θ
x
⁢
and
(
Eq
.
9
)
Y
c
=
Y
e
+
S
0
⁢
sin
⁢
θ
y
;
(
Eq
.
10
)
wherein the contact lens does not have any fiducial marks.

84 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/457,697Filed 29 Aug 2023 · us provisional application
Priority: 30 Aug 2022
Published: US 2024/0069361 A129 Feb 2024
Granted: 6 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G02C 7/047
Contact lenses for the eyes: contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae
A61B 3/1015
Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions: for wavefront analysis
G02C
Spectacles
A61B
Medical diagnosis and surgery