miliwire.blogg.se

1. #IRREGULAR PUPIL SHAPE AFTER CATARCT NORMALIZES FULL#
2. #IRREGULAR PUPIL SHAPE AFTER CATARCT NORMALIZES FREE#

It combines the mechanisms of the lenses as described above to achieve these effects. These specialised designs can simultaneously correct astigmatism and provide multidistance vision (distance & near). This allows for a future adjustment where the near part can be removed easily if there are any future wear and tear changes in the eye that could benefit from removal of the ringed component. This is a state of the art system which allows the multifocal lens to be split into components – the distance part (no ring elements) and the near part (with the ring elements). The diagram below shows how 3 focal distances corresponding to distance, intermediate and near are achieved with multifocal lenses.Ĭompare this to a standard lens below where there are no rings or segments and therefore cannot focus different distances. The rings enable light to bend differently when arriving from different distances thereby allowing focus for light coming from distance and near objects. How these work: The lenses have micro-rings built in their very precise technological design. These specialised lenses enable a patient to see distance and near with minimal to no dependence on glasses. Multifocal (bifocal and trifocal) lenses: Note the fine lines on the lens which the surgeon uses to align the lens to marks made on the eye at a pre-calculated axis.

#IRREGULAR PUPIL SHAPE AFTER CATARCT NORMALIZES FREE#

Patients achieve excellent glasses free vision from these. It is used when astigmatic incisions alone will not be sufficient in higher errors. These are specialized lenses that have different curves in different axes to counteract the axes shape abnormalities in patients’ eyes. Specialised Premium lens implants used in lens replacement surgery: Astigmatism corrective (TORIC) lenses: This enables a patient to see clearer without glasses. It converts the abnormal rugby ball shape of the front of the eye as seen in astigmatism, to a more normalised rounded football shape. These are specially measured cuts made to the cornea. In laser eye surgery for older patients, to maintain reading vision there needs to be some minor separation where one eye is more weighted for distance and the other eye for near (monovision format).

#IRREGULAR PUPIL SHAPE AFTER CATARCT NORMALIZES FULL#

allowing for full simultaneous distance and near vision with each eye independently.being less susceptible to focus variations that occur from the ageing natural lens (which is removed and replaced in this procedure, unlike in laser eye surgery where the natural lens in not treated).In patients over 45 seeking glasses independence, this procedure is often chosen over laser vision correction because it offers the added advantages of:

Like laser eye surgery, lens replacement surgery can be used to treat a wide range of focusing errors including myopia, hyperopia and astigmatism. The lens implants used can be of a number of specialised varieties to enable high levels of spectacle independence for distance AND reading tasks. The natural lens in the eye is removed and replaced with a lens implant.