Abstract: An apparatus for and methods of determining that the placement and alignment of progressive add lenses (PALs) in a subject's frame are correct. Namely, a PAL verification tool includes a chart and light source, wherein the chart is viewed by the subject and the light source is worn by the subject during a PAL verification process. The PAL verification method may include the steps of positioning the subject with respect to a near fixation point, the subject viewing the near fixation point with one eye and bringing it into best and clearest vision, measuring and recording a first head position with respect to the near fixation point, the subject viewing the near fixation point with the other eye and bringing it into best and clearest vision, measuring and logging a second head position with respect to the near fixation point, and determining the amount and direction of the difference in the first and second head positions and correlating to an amount and direction of PAL misalignment.

Abstract: An apparatus for and methods of determining that the placement and alignment of progressive add lenses (PALs) in a subject's frame are correct. Namely, a PAL verification tool includes a chart and light source, wherein the chart is viewed by the subject and the light source is worn by the subject during a PAL verification process. The PAL verification method may include the steps of positioning the subject with respect to a near fixation point, the subject viewing the near fixation point with one eye and bringing it into best and clearest vision, measuring and recording a first head position with respect to the near fixation point, the subject viewing the near fixation point with the other eye and bringing it into best and clearest vision, measuring and logging a second head position with respect to the near fixation point, and determining the amount and direction of the difference in the first and second head positions and correlating to an amount and direction of PAL misalignment.

Abstract: A visual axis and alignment measurement system and method of using same are disclosed. In particular, a visual axis measurement system of the present disclosure includes a visual axis measurement device and a near point target. The visual axis measurement device includes a pair of opaque lenses, each having a slit therein, that are adjustably coupled via a coupling mechanism. The visual axis measurement device also includes a linear measurement device. Via self-adjustment, the patient may align the respective slits for his/her dominant and non-dominant eyes along his/her visual axes until the near point target is in focus. After which, the distance between the centers of the slits is measured in order to determine accurately the placement of bifocal lens segments within eyeglass lenses. In doing so, it is ensured that the prescription for, for example, progressive bifocal corrective lenses, which have narrow viewing areas, is correct.

Abstract: A visual axis and alignment measurement system and method of using same are disclosed. In particular, a visual axis measurement system of the present disclosure includes a visual axis measurement device and a near point target. The visual axis measurement device includes a pair of opaque lenses, each having a slit therein, that are adjustably coupled via a coupling mechanism. The visual axis measurement device also includes a linear measurement device. Via self-adjustment, the patient may align the respective slits for his/her dominant and non-dominant eyes along his/her visual axes until the near point target is in focus. After which, the distance between the centers of the slits is measured in order to determine accurately the placement of bifocal lens segments within eyeglass lenses. In doing so, it is ensured that the prescription for, for example, progressive bifocal corrective lenses, which have narrow viewing areas, is correct.