Neitz RX-RC Instruction Manual
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103-5 Astigmatic Axis ExaminationWhen the angles of scanning the examined eye and the motion of reflex are not relatedwith the movement or against movement but are the same, this meridian of eye is amain meridian. If they are not the same, the angle of movement of reflex is a mainmeridian, and the meridian which is apart 90 degrees from the main meridian becomesthe other meridian. Either of their meridians is astigmatic axis.3-6 Determining Refraction(1) Scan the naked eye and wear in 12mm front of patient’s eye the (+) lens in caseof movement or the (-) lens in case of against movement (or by using retinoscopyrank), and find the neutrality point by increasing 0.5 to 1.0D.* Since against movement is hard to observe comparing with movement, ifagainst movement exists, more high accuracy neutrality can be obtained byadding the (-) lenses until movement can be observed and increasing the (-)lenses step by step.(2) The relation between the lens power required for neutralization and the refractionis shown below.Refraction = Lens power required for neutralization –(1/examination distance[m])(3) After confirming the refraction of the main meridian, find the neutrality point of theother main meridian in the same procedures.3-7 Accessories(1) HeadrestWhen performing the examination withglasses on, remove the cover on the Headrestmount to insert the accessory Headrest intothere (see Fig. 3-5). It is hard to scratch theglasses by operating the RX-RC while puttingthe Headrest on your forehead.(2) Presbyopic LensWhen using the presbyopic lens, loosen andturn the Viewing window rim to be removed,and then put the presbyopic lens on it.* +2D of presbyopic lens is provided as the stanadard accessory.Fig. 3-5 |
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