Progressive ophthalmic lenses
Methods of designing at least one progressive ophthalmic lens for a user having a dominant eye and a non-dominant eye are provided. These methods include determining a first inset for a lens for the dominant eye, and determining a measurement of phoria of the user. The methods further include determining a second inset for a lens for the non-dominant eye depending on the first inset and on the measurement of phoria, and designing the lens for the non-dominant eye according to the second inset. Systems, computer systems and computer program products suitable for performing these design methods are also provided. Progressive ophthalmic lenses designed according to said design methods are also provided.
1. A method of designing at least one progressive ophthalmic lens for a user having a dominant eye and a non-dominant eye, the method comprising:
determining a first inset for a lens for the dominant eye;
determining a measurement of phoria of the user;
determining a second inset for a lens for the non-dominant eye depending on the first inset and on the measurement of phoria; and
designing the lens for the non-dominant eye according to the second inset.
2. The design method according to claim 1 , wherein determining the first inset for the lens for the dominant eye comprises determining the first inset with a fixed value of between 2 and 3 mm.
3. The design method according to claim 1 , further comprising:
determining a measurement of far inter-pupillary distance for the user;
determining a measurement of near inter-pupillary distance for the user;
determining a measurement of working distance depending on a power for near vision prescribed to the user; and
determining a measurement of vertex distance depending on a glasses frame selected for the user; and wherein
the determining the first inset for the lens for the dominant eye comprises determining the first inset depending on the measurements of far inter-pupillary distance, near inter-pupillary distance, working distance and vertex distance.
4. The design method according to claim 3 , wherein the determining the first inset depending on the measurements of far inter-pupillary distance, near inter-pupillary distance, working distance and vertex distance comprises determining the first inset according to the following formula:
inset_
dom
=
FIPD
2
-
WD
-
VD
WD
/
(
NIPD
/
2
)
Formula
1
wherein:
inset_dom is the first inset for the lens of the dominant eye,
FIPD is the measurement of the far inter-pupillary distance,
NIPD is the measurement of the near inter-pupillary distance,
WD is the measurement of the working distance depending on the prescribed power for near vision, and
VD is the measurement of the vertex distance.
5. The design method according to claim 1 , wherein the determining the second inset for the lens for the non-dominant eye comprises determining the second inset according to the following formula:
inset_
nondom
=
inset_dom
-
Ph
×
10
1000
×
12
Formula
2
wherein:
inset_nondom is the second inset for the lens of the non-dominant eye of the user,
inset_dom is the first inset for the lens of the dominant eye of the user, and
Ph is the measurement of phoria of the user.
6. The design method according to claim 1 , further comprising:
determining a measurement of near inter-pupillary distance of the user;
determining a measurement of working distance depending on a power for near vision prescribed to the user; and
determining a measurement of vertex distance depending on a glasses frame selected for the user; and wherein
the determining the second inset for the lens for the non-dominant eye comprises determining the second inset depending on the first inset, the measurement of phoria and the measurements of near inter-pupillary distance, working distance and vertex distance.
7. The design method according to claim 6 , wherein the determining the second inset depending on the first inset, the measurement of phoria and the measurements of near inter-pupillary distance, working distance and vertex distance comprises determining the second inset according to the following formula:
inset_
nondom
=
inset_dom
-
Ph
×
(
VD
/
sin
(
arc
tg
(
WD
/
(
NIPD
/
2
)
)
)
)
1000
cos
(
90
-
arc
tg
(
WD
/
(
NIPD
/
2
)
)
)
Formula
3
wherein:
inset_nondom is the second inset for the lens of the non-dominant eye,
inset_dom is the first inset for the lens of the dominant eye,
NIPD is the measurement of the near inter-pupillary distance,
WD is the measurement of the working distance depending on the prescribed power for near vision,
VD is the measurement of the vertex distance, and
Ph is the measurement of phoria of the user.
8. The design method according to claim 1 , further comprising:
designing the lens for the dominant eye according to the first inset.
9. A method of manufacturing at least one progressive ophthalmic lens, the method comprising:
designing the at least one progressive ophthalmic lens by performing a design method according to claim 1 ; and
manufacturing the at least one progressive ophthalmic lens according to the result of designing the at least one progressive ophthalmic lens.
10. A computer system comprising a nonvolatile memory and a processor, wherein the memory stores computer program instructions executable by the processor, the instructions comprising logic for executing a design method according to claim 1 .
11. A computer program product stored on nonvolatile memory and comprising program instructions that cause a system to execute a design method according to claim 1 .
12. The design method according to claim 2 , wherein the determining the second inset for the lens for the non-dominant eye comprises determining the second inset according to the following formula:
inset_
nondom
=
inset_dom
-
Ph
×
10
1000
×
12
Formula
2
wherein:
inset_nondom is the second inset for the lens of the non-dominant eye of the user,
inset_dom is the first inset for the lens of the dominant eye of the user, and
Ph is the measurement of phoria of the user.
13. The design method according to claim 3 , wherein the determining the second inset for the lens for the non-dominant eye comprises determining the second inset according to the following formula:
inset_
nondom
=
inset_dom
-
Ph
×
10
1000
×
12
Formula
2
wherein:
inset_nondom is the second inset for the lens of the non-dominant eye of the user,
inset_dom is the first inset for the lens of the dominant eye of the user, and
Ph is the measurement of phoria of the user.
14. The design method according to claim 4 , wherein the determining the second inset for the lens for the non-dominant eye comprises determining the second inset according to the following formula:
inset_
nondom
=
inset_dom
-
Ph
×
10
1000
×
12
Formula
2
wherein:
inset_nondom is the second inset for the lens of the non-dominant eye of the user,
inset_dom is the first inset for the lens of the dominant eye of the user, and
Ph is the measurement of phoria of the user.
15. The design method according to claim 2 , further comprising:
determining a measurement of near inter-pupillary distance of the user;
determining a measurement of working distance depending on a power for near vision prescribed to the user; and
determining a measurement of vertex distance depending on a glasses frame selected for the user; and wherein
the determining the second inset for the lens for the non-dominant eye comprises determining the second inset depending on the first inset, the measurement of phoria and the measurements of near inter-pupillary distance, working distance and vertex distance.
16. The design method according to claim 3 , further comprising:
determining a measurement of near inter-pupillary distance of the user;
determining a measurement of working distance depending on a power for near vision prescribed to the user; and
determining a measurement of vertex distance depending on a glasses frame selected for the user; and wherein
the determining the second inset for the lens for the non-dominant eye comprises determining the second inset depending on the first inset, the measurement of phoria and said measurements of near inter-pupillary distance, working distance and vertex distance.
17. The design method according to claim 4 , further comprising:
determining a measurement of near inter-pupillary distance of the user;
determining a measurement of working distance depending on a power for near vision prescribed to the user; and
determining a measurement of vertex distance depending on a glasses frame selected for the user; and wherein
the determining the second inset for the lens for the non-dominant eye comprises determining the second inset depending on the first inset, the measurement of phoria and said measurements of near inter-pupillary distance, working distance and vertex distance.