Testing for npa
- 1. Testing for NPA and NPC By- Raju RATHORE
- 2. Testing for Near Point of Accommodation (NPA) Testing for Near Point of Convergence (NPC) 1 2
- 3. Add your title Add your title Add your title Add your title Testing for Near Point of Accommodation (NPA) 1. With the patient wearing full distance correction and with t he left eye occluded, place the near testing card at a distance of 16 inches (40 cm) f rom the patient and ask the patient to read the 20/40 line with the unocclude d eye. 2. Move the test card slowly toward the patient as you ask th e patient to state when the letters have become blurred. 3. Record this distance in centimeters or inches (whichever yo u are using).
- 4. 4. Repeat steps 1-3 for the other eye and record as described above. 5. The NPA is that point (in centimeters or inches) where the patient can no lon - ger bring the image into clear focus.
- 5. Add your title Add your title Add your title Add your title Testing for Near Point of Convergence (NPC) 1. With the patient wearing appropriate correction and with neit her eye occluded, hold a target, such as a pencil tip, at a distance of approximately 16 inches (40 cm) from the patient and ask the patient to fixate on it. 2. Move the object slowly forward and ask the patient to tell you when the object doubles.
- 6. 3. Observe whether both eyes are converging. 4. Note the position at which the image doubles or one eye deviate s away from the fixation target. The NPC is that point where a single image can no l onger be maintained. Record the distance (in centimeters or inches) betwee n that point and the upper bridge of the nose at the midpoint between the eye s.