optical centre

centre, optical 

That point (real or virtual) on the optical axis of a lens which is, or appears to be, traversed by rays emerging parallel to their original direction. Applied to an ophthalmic lens, it is commonly regarded as coinciding with the vertex of either surface (British Standard). See nodal points; vertex.
References in periodicals archive ?
It supports all-at-once measurements of key evaluation items, such as optical centre wavelength, level, OSNR and spectrum width, and displays these results on one screen.
As discussed in case 1, single vision wearers are able to modify their head position to ensure that they are viewing closer to the optical centre of the lenses, thus reducing the exposure to differential prism.
Where [DELTA]F is the difference in the distance power between the two lenses along the vertical meridian; c is the vertical distance from the optical centre for distance to the NVP.
The prescription and optical centres of the lenses were correct and been glazed vertically in line with the patient's pupils in the primary gaze position.
The teams also sealed seven fake dentists including Shamsi Dental and Optical Centre Syed Dental Care Centre, Allah Ditta Dental Clinic, Rehman Dental Clinic, Doctors Dental Clinic, Tasleem Tufail Dental Clinic and Dental Care Clinic.
The businesses of Shamsi Dental and Optical Centre, Syed Dental Care Centre, Allah Ditta Dental Clinic, Rehman Dental Clinic, Doctors Dental Clinic, Tasleem Tufail Dental Clinic and Dental Care Clinic were also sealed.
Nick Shell of the Optical Centre NE and an ex-pupil of Easington Comp donated 1,500 pairs of unwanted spectacles to the Lions Club Sight First Campaign
Faller, A direct and sensitive method for positioning the center of mass of the dropping object at the optical centre of the enclosed corner cube in ballistic absolute gravimeters, Metrologia 41, L19-21 (2004).
The Rhymney Optical Centre will open today and will provide NHS and private patients with a full range of services, including eye examinations, spectacles and contact lenses, as well as all schemes under the Wales Eye Care Initiative.
Rhymney Optical Centre can be contacted on 01685 843 077.
Kerr found the biggest problem was with the optical centres of the glasses – the area in a lens you look through and which should be level with your pupils.
A "wavy image" was found on both lenses of one pair sold by Marks & Spencer while glasses from WH Smith had "minor defects" with the alignment of optical centres.

Full browser ?