By Mott N.F.
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Spectacle can not correct irregular astigmatism. It is treated by substituting a new surface and this can be achieved with a contact lens usually RGP lens, corneal graft or laser surgery. 4. T By oblique astigmatism, we mean that the axis of the correcting cylinder is other than near 90 degrees or 180 degrees (other than with or against the rule astigmatism). 5. F In against-the-rule astigmatism, the plus cylinder is at 180 degrees and the minus cylinder is at 90 degrees. In with-the-rule astigmatism, the plus cylinder is at 90 degrees and the minus cylinder is at 180 degrees.
Varifocal or progressive lenses have no visible interface between the distance and near portions unlike bifocal or trifocal lenses. There is a power progression corridor (intermediate portion) which reduces the image jump seen in bifocal glasses; however on either side of the corridor aberration or astigmatism induced can become intolerable. The soft designs have wider progressive corridor and therefore bigger intermediate portion for VDU work. 60 XII. Contact lenses 1. The power of a contact lens is determined by its: a.
Esotropia due to high AC/A ratio tends to be worse for near than distance and can be corrected with bifocal glasses to reduce the accommodation or recession of medial recti. 6. T They are also called the Purkinje-Sanson images. The images are formed at 4 surfaces: the anterior (image 1) and posterior (image 2) corneal surfaces and the anterior (image 3) and posterior (image 4) lenticular surfaces. The first three images are erect and virtual whereas the last one is inverted and real. The first image is used for keratometry and images 3 and 4 are used for accommodation.