A Scan technique and principles for getting acccurate values for evaluation'

ascan

1. IMMERSION BIOMETRY Getting Perfect Results DR IRSHAD EDAVANA ASSOCIATE PROFESSOR MALABAR MEDICAL COLLEGE

2. TRAINING TECHNICAL STAFF IMMERSION TECHNIQUE SPIKE PATTERN INTERPRETATION CORRELATION OF MEASURMENT WITH PATIENTS REFRACTIVE STATUS CHECK FOR INTER EYE DIFFERENCE ERGONOMICAL DESIGNED ROOM WITH ADEQUTE SPACE

3. HOW DOES BIOMETRY WORKS

4. CONTACT A SCAN

5. CONTACT A SCAN 01 CORNEAL COMPRESSION 02 CORNEAL ABBERATION 03 POOR REPEATABILITY

6. IMMERSION A SCAN

7. How do I know I’m perpendicular to visual axis? Five high spikes Retinal spike should be steeply rising RETINAL SPIKE IS NOT PERPENDICULAR

8. EQUAL LENS SPIKES Lens spike too short Sound beam through lens at an angle rather than center of front and back surfaces

9. Misaligned along optic nerve No sclera at optic nerve, therefore no scleral spike present on display

10. Proper Gain Level Degree of amplification of echoes on display screen Too high, lose resolution Too low, difficult to get spikes Good resolution of retina and sclera gain should be set at the lowest level at which a good reading is obtained PR0PER GAIN

11. PSEUDOPHAKIK

12. IOL POWER CALCULATION

13. IOL CALCULATION

14. GETTING PERFECT RESULT TRAINED STAFF POSITIONING OF PATIENT WELL ALIGNED PROBE APPROPIATE GAIN PROPER FORMULA

15. THANKYOU