Low Vision Evaluation. Ms MB JAN- 24/01/2012. Content. The difference between a low vision exam and a regular exam The Case History Evaluating visual performance. 4. Evaluating visual performance Visual acuity Visual field evaluation Contrast sensitivity Colour vision
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Ms MB JAN- 24/01/2012
4. Evaluating visual performance
5. Objective refraction
6. Subjective refraction
7. Ocular health evaluation
At the end of this lecture, learners should be able to:
Give the differences and explain
each point given
NB. Very important, It has to be even more detailed
Why is it important to take LV
5. Medical history
6. Employment or school history
8. Social assessment
10. General appearance of patient
Evaluating visual performance
1.Why do we want to accurately measure acuity?
2. Limitations of VA measurement
3. Factors affecting VA measurements
4. Distance Visual Acuity
5. Near Visual Acuity
Factors affecting VA measurements
The following aspects of chart design can be considered
Refer to your notes for advantages and disadvantages
Of this chart
If the patient is unable to identify any optotypes, which designations are you going to use?
Specification of Nearpoint acuity
Always obtain the best possible refraction with the best possible VA – to give the lowest magnification, why?
1 General conditions
2 The trial frame
3 The JND (just noticeable difference)
4 Spherical refraction
5 Cylindrical refraction
Why do we use it?
The refraction itself
Use standard methods and background knowledge to refine cylinder axis, power and sphere power