this power points explains the global importance of lowvision aids

1. Low vision aids
Global importance
DR.K.ILANGO
LOW VISION
SPECIALIST
Ilango.krishnamurthy@g
mail.com

3. DEVELOP AND MAKE AVAILABLE
LOW VISION SERVICES AND OPTICAL
DEVICES FOR ALL THOSE IN
NEED,CERTAIN LOW VISION DEVICES CAN
BE MANUFACTURED LOCALLY OR
PURCHASED EXTERNALLY IN BULK
SUPPLIES TO REDUCE COSTS
(WHO/PBL/97.61 VISION2020-GLOBAL
INITIATIVE FOR THE ELIMINATION OF
AVOIDABLE BLINDNESS)

4. A Global Estimate of Low Vision Care Needs
148 million visually disabled (blind+ low vision, ref. ICD-10)
8 million blind, without any perception of light
35 million in need
of low vision care
105 million in need of cataract
surgery and/or routine refraction
25% 75%
140 million partially sighted
(of whom 30 million blind, but having some residual vision)

6. LOW VISION DEFINITION
“A PERSON WITH LOW VISION IS ONE WHO HAS IMPAIRMENT
AND /OR STANDARD REFRACTIVE CORRECTION AND HAS A
VISUAL ACUITY OF LESS THAN 6/18 TO LIGHT PERCEPTION IN
THE BETTER EYE OR A VISUAL FIELD OF LESS THAN 10 DEGREES
FROM THE POINT OF FIXATION, BUT WHO USES OR IS
POTENTIALLY ABLE TO USE , VISION FOR THE PLANNING
AND / OR EXECTUION OF A TASK” (WHO/PBL/93.27)

7. HISTORICAL BACKGROUND
 EARLY 19TH CENTURY
 RESIDUAL VISION TO BE PRESERVED
 LATE 19TH CENTURY
 VISION CAN BE ENHANCED
 CHANGE IN MINDSET

8. GERALD FONDA
 COINED THE TERM LOW VISION 1953

9. Simple non optical aid
DISCOVERED BY PRENTICE
A SLIT CUT IN A BLACK CARD BOARD
REDUCES GLARE AND
INCREASES THE CONTRAST

10. TYPOSCOPE

11. 1930-WILLIAM FLEINBLOOM
PIONEERED LOWVISION AIDS

12. 1959
FIRST PROTOTYPE
CC TV

13. STAND MAGNIFIER
A HAND MAGNIFIER MORE THAN 20D
DIFFICULT TO MAINTAIN OBJECT TO IMAGE
DISTANCE
LENS IN STAND MAGNIFIER MOUNTED LESS THEN ITS
FOCAL DISTANCE FROM OBJECT FORMS A
MAGNIFIED ERECT VIRTUAL IMAGE LOCATED AT
INFINITY
DEMANDS MINIMAL ACCOMDATION

14. ASPHERIC GLASSES
 NO PERIPHERAL DISTORTIONS
 HIGH INDEX GLASSES
 INJECTION MOULD
 POWERS UPTO40X
 CLOSE WORKING DISTANCE/HANDS
FREE
 BLANKS FROM ISRAEL
 TOOLS AVAILABILITY

16. CLOSED CIRCUIT
TELEVISION SCANNER
 ELECTRONIC MAGNIFICATION UPTO
40X
 CHARGED COUPLE DEVICE
 PATIENTS WITH PROFOUND LOW
VISION
 WIDER FIELD/NEGATIVE CONTRAST
 HIGH COST/AFFORDABILITY

18. THE PARTIALLY SIGHTED
PATIENT
IN FACT IT IS RATHER APPARENT THAT
PATIENTS WITH SUBNORMAL VISION
CONSTITUTE A NEGLETED SPECIES.
THIS INATTENTION IS ESPECIALLY
UNFORTUNATE SINCE THOSE WHO CAN BE
HELPED BY VISUALAIDS COMPRISE NO
SMALL POPULATION
-(the fine art of prescribing glasses;Benjamin milder)

19. CONCLUSION
 IT IS A MYTH THAT LOW VISION AIDS
ARE EXPENSIVE AND NOT AVAILABLE
AT MANY PLACES
 IT IS THE WILLINGNESS TO HELP LOW
VISION PATIENTS BY EYE CARE
PROFESSIONALS IS THE URGENT NEED
OF THIS HOUR

20. When one door of happiness
closes, another opens; but often
we look so Long at the closed door
that we do not see the one which
has opened for us

21. CONCLUSION
 IT IS A MYTH THAT LOW VISION
AIDS ARE EXPENSIVE AND NOT
AVAILABLE AT MANY PLACES
 IT IS THE WILLINGNESS TO HELP
LOW VISION PATIENTS BY EYE
CARE PROFESSIONALS IS THE
URGENT NEED OF THIS HOUR