Optometry Mails

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  By Joshua Enyoyo Yusuf Low vision is prominent among geriatrics that are frequently relatively immobile so that the retention of some ability to read is of vital importance. Low vision aids improve the reading capability and speed of reading. Visual aids for distance are less practical than those for near. Accurate refraction and appropriate illumination should be ensured for optimal retinal image. Magnification is the basis of most techniques used in low vision clinic. There are three methods of enlarging the retinal image :-  By bringing the object nearer to the eye.  By magnification of the retinal image. By increasing the size of the object to be viewed.  Bringing the object nearer to the eye, leads to larger visual angle being subtended at the eye.  Magnification, though increases the size of retinal image, leads to diminished visual field and reduced depth of focus. Due to this, lighting should be ample and directed on the fixation area. Therefore, lowes...

Ayomikun Dahunsi (OD)   To magnify means to increase, to enlarge, to enhance, to expand and a lot more. In the context of low vision, Magnification means to increase the retinal image size. This makes seeing an object easier for people with visual impairment. There are several ways of magnification for patients with low vision; ●      Relative Size Magnification ●      Relative Distance Magnification ●      Angular Magnification   RELATIVE SIZE MAGNIFICATION In this case, the object is made twice the size thereby making the image on the retina twice as large hence creates X2 magnification. For example, large prints book or television with large screen size. This type of magnification because of the physical limitations of how large you can make an object such as book look like, it is often limited to about X2.5             M = New Object Size ...