Aids for Peripheral Field Loss
Functional Effects of Peripheral Field Loss Even people with very good visual acuity can be severely visually impaired if their visual field is reduced. When the visual field is constricted…
Instruction and Training in the Use of Magnifiers
Instruction in the Use of Low Vision AIDS A task-oriented approach has been adopted throughout the low vision assessment, with the patient identifying what they want to do and a…
Special Training Techniques for Visual Field Loss
Central Field Loss When someone with bilateral central field loss looks straight at an object, it will fall into the scotoma and not be seen. This effect has been known…
The Low Vision Assessment
Scheduling the Appointment Depending on the clinic setting, the content and format of a low vision assessment will vary. For example, in a hospital eye service (HES) clinic, fundus examination…
Evaluating Low Vision Services
Optometrists may find it unusual to consider the concept of ‘success’ in relation to one of their prescribing strategies, because the supply of spectacles for the correction of refractive error…
Rehabilitation Techniques for Nystagmus
Nystagmus is an involuntary ocular oscillation which includes a slow phase eye movement as part of each cycle. Visual impairment can result, either from the oscillation itself, or from an…
Prescribing Magnification
Once it has been concluded that refractive correction alone will not be sufficient to improve vision to the required level, magnification will be needed. This may be combined with other…
The Eye Examination
There are a number of tests which could be carried out at this stage to confirm what the patient has told you about their ocular condition, or what you have…
Contrast and Glare
Improving Visibility of the Retinal Image Into this category come a wide range of very simple strategies which are designed to aid vision, but do not affect the vergence or…
Illumination and Lighting
Terminology The amount of light emitted by a light source is called the luminous flx and is measured in lumens . The efficacy of a particular light source is the…
