Comprehensive Refractometer Operation Steps
1. Comprehensive refractometer operation steps
Before testing the subject, should first understand his history, routine eye examination, retinoscopy or computer optometry data, refractometer check the instrument measurement results and other information.
① seized by the seizure of the chair, the instrument positioning in front of the patient, naked eye facing the optometry head, adjust the height of the chair or table, so that the height of the subject and the optometrist height match.
② with alcohol disinfection after the care, so that the patient forehead against the top.
③ Turn the ball knob so that the dial, refractometer cylinder and axial knob to zero degrees. Turn the assist knob to O or O, the prism and cross-cylinder are placed in the initial position and can not be added to the test window.
④ turn the horizontal button so that the bubble in the center position, to ensure that the instrument at a level.
⑤ Turn the interpupillary distance knob so that the PD value is consistent with the interpupillary distance of the subject. Look at the distance when the pupil on the outside.
⑥ adjust the height of the optometry head, so that the subjects were eyes in the center of the hole.
⑦ Turn the forehead button to observe and adjust the distance between the cornea and the lens. Observation window, the long line represents 13.75mm, three short-term spacing 2mm. If the corneal vertex is not on the long line, refractometer display the degree plus the correction value, only the actual degree. When the degree of display is (+), the correction value is a table, the display degree is (-), the correction value with b table.
⑧ to indoor lighting, tune to darker. Look far away, do not turn on the headlights.
⑨ look near, pupil from the bar breaking to the inside, open the headlights. Put down the test lever and move the myopia card to the desired position.
⑩ with cross-cylinder examination, pay attention to the cross-cylinder axis of the instrument to adjust the axial alignment with the instrument cylinder.
① Before the test must check the knob, dial, adjust the lever position is correct, the operation is flexible.
② Note whether the eyes of the subject is located in the center of the hole, corneal vertex and scale line position, instrument level and interpupillary distance is correct.
③ no zero scale, we must first zero. refractometer To avoid the following work to bring unnecessary trouble.
④ pay attention to the subject's head position, sitting position is correct, the instrument height is matched. Even if the photographer during the head of the subject also do not skew, so as not to deviation from the axial position of the cylinder.
⑤ indoor lighting must be darker.
⑥ look far away, do not open the headlights.
⑦ look near, do not forget to adjust the interpupillary distance within the shift lever.
⑧ optometry head height adjusted, the locking lever must be locked, so as to avoid bumps accident.