Test of distance vision, near vision visual field bs ed

Presentation on Test of distance vision, near vision and visual field for Bachelor of Special Education (BSEd), Education for visually impaired course, Bangladesh Institute of Special Education
Bangladesh

1. Test of Distance vision, near vision and Visual field using E chart Bachelor of Social Education ( BSEd ) Education of Visually impaired Nusrat Zerin

2. Visual Acuity: It is a number that indicates the sharpness or clarity of vision. A visual acuity measurement of 20/70 means – a person with 20/70 vision who is 20 feet from an eye chart sees what a person with unimpaired (or 20/20) vision can see from 70 feet away. (after all possible solution and treatment) 6/60 means – can read 60 size font from 6 meters)

3. Visual Acuity:

4. Visual Acuity testing: Need- E chart, measurement tape, torch Select a place or room which has adequate light & less glare or reflection of light Avoid extra lights Avoid light from behind of the place where the E chart will be placed or shown Mark the distance with measurement tape (6 meters) (1 meter=39 inches) Orient the child with the chart & give instruction to indicate the open side of E or which side the legs of ‘E’ are open. The child can show it with hand movement. Stand in front of the child & place E chart at the level of the child’s eye at 6 meter distance (child can be seated on a chair or standing)

5. Visual Acuity testing:…………2 7. Ask the child to cover left eye with his/her palm 8. Show the big E and ask the direction of the open legs of E 9. If it is ok then ask him to show direction of the next small E . If it is wrong answer, repeat to show the E in several Direction. If it wrong 3 times and record the distance and the font size of the E for Right eye: 10. If the Child can not see the Big E, reduce the distance to 3 meters. 11. Then show Big E again and ask to indicate the direction. Repeat the process. And Record the Visual Acuity. Right Eye: 6/36

6. Visual Acuity testing:…………3 7. Ask the child to cover left eye with his/her palm 8. Show the big E and ask the direction of the open legs of E 9. If it is ok then ask him to show direction of the next small E . If it is wrong answer, repeat to show the E in several Direction. If it wrong 3 times and record the distance and the font size of the E for Right eye: 10. If the Child can not see the Big E 3 times, reduce the distance to 3 meters. 11. Then show Big E again and ask to indicate the direction. Repeat the process. And Record the Visual Acuity. Right Eye: 6/60 Right Eye: 3/36

7. Visual Acuity testing:…………4 12. If the child can not see the big E from 3 meters 3 times, reduce the distance to 1 ½ meter and repeat the process and record acuity. 13.If the child can not see the big E 3 times then stand in front of the child at 40 centimeter distance and ask to count your fingers & record the visual acuity : 14. If child can not count fingers 3 times, move your hand in different directions in front of the child’s eye. If he can see record Visual acuity: Right Eye: Finger counting (FC) Right Eye: 1 ½ /36 Right Eye: Hand movement (HM)

8. Visual Acuity testing:…………5 15. If the child can not see hand movement 3 times put torch light to the eye from different directions to the eye, ask if he/she can see any light and if he/she can show the direction. If the response is yes, then record acuity: If 3 times the child can not say rightly, the record will be No light Perception (NLP). Now complete the process with Left eye, (covering the right eye with palm) record Visual acuity measurement process in left eye: like- Right Eye: Light perception (can indicate the direction of the light ) Right Eye: Hand movement Left Eye 1 ½ /60 Right Eye: No Light perception (NLP) / NPL

9. Visual Acuity testing:…………7 This is primary identification. Please refer the child to an eye ophthalmologist / optometrist/ recreationist if you find any problem with the child for proper treatment/correction or certification.

10. Near visual acuity: Check near visual acuity. Have the examinee read a card held apprx . 14 inches (35.6 cm) away, at a normal reading distance. Use bright lighting during this test. Decreased near visual acuity may be caused by central cataracts or presbyopia, after age 40

11. Visual Field: Visual field is the total area an individual can see without moving the eyes from side to side (in between 180 degree or 170 degree (on average)

12. Visual Field testing: Stand in front of the child and ask him to see directly Then ask him to expand him hands to one side parallel to thee body (right hand) Ask him to move only fingers and gradually move the fingers and hand at the front side, he can not move his eye ball of the right eye, he has to see at the front only Ask him to stop moving the hand from where he can not see the fingers Record the visual field: Visual field Right eye= 5 degree less than 90 degree 6. Repeat with Left eye and record visual field 7. Then calculate the both eyes total field and complete the visual field calculation. 8. If it is less than 10 degree the child will be treated as low vision.

13. Thanks