pressure-paste type of pressure put mirror ball and put pressure prism. Spherical stickers pressure is the use of aspheric optical design principle, pose a series of concentric circles, greatly reduced the thickness of the mirror ball, no matter how much refractive power, the thickness of the lens are only 1mm. Prism is the use of pressure put FRESNEL. The principle of a series of narrow prism of the traditional prism closely arranged in a flat – Zhang thin plastic board composition, similar to reduce the thickness of the lens, 40 △ prism of the pressure patch, the thickness of only lmm. 3M of the United States following the company's film put pressure prism, for example, would be fitting methods are as follows.
1 pressure-paste method of optometry
1.1 put pressure spherical refraction of the methods of pressure
paste suitable for the main mirror ball following: a high degree of refractive errors, congenital cataract surgery, no crystal eyes, in patients with low vision to read enlarged, Diabetes temporary refractive errors, anisometropia, as well as two-light microscope for all. Spherical stickers pressure distribution using conventional optometric and optical methods to determine the optometric prescription. As a result of pressure put spherical refraction of the specification is fixed, negative-1D from the spherical-14D to a total of 14 specifications, are mirror ball from +0.50 D to +16 D total of 16 specifications, there is no astigmatism lenses. As a result, the pressure to identify spherical prescription paste, a comprehensive framework to put pressure lenses and lens-effective, and to make appointments in line with the prescription. If the prescription for the optometry-0.00DS, just-8.00DS there's pressure put the ball lenses, mirror on the framework for the allocation of plain glass lenses, and then paste the pressure-8.00DS. Optometric prescription as to cope with pressure-10.50D paste mirror ball, the prescription should be pressure-0.50DS paste-10.00DS, that is equipped with a lens-0.50DS framework, combined with the pressure-10.00DS lenses affixed to the ball. Prescription can also paste + O.50DS pressure-11.00DS, that is equipped with a +0.50 DS framework of the lens, coupled with the pressure-11.00DS lenses affixed to the ball. Another example is the prescription for -10.00DS/-0.75DCx180, is equipped with a lens-0.75DCx180 of astigmatism and then paste the pressure of the pressure-10.00DS lenses affixed to the ball. If a prescription for-14.00DS, is equipped with a plain glass piece, and then paste the pressure of the pressure-14.00DS lenses affixed to the ball.
1.2 put pressure prism of optometry method
put pressure prism for strabismus, diplopia and nystagmus. First, determine appointments to correct refractive errors of the prescription, and then check to determine put pressure prism of the prism degree.
1.2.1 strabismus put pressure △ prism of
identified in the inspection found when the eye-squint, is the first to identify the significant ramp or ramps hidden. The significant difference is inclined to concomitant strabismus or paralytic strabismus, whether implicit or oblique enough to significantly ramp should be used to increase under Ma oblique angle prism to determine the size of the paralytic strabismus increase △ prism for the elimination of the minimum prism diplopia △ , The concomitant strabismus in wearing eye-glasses can not maintain, is situated, can be used to maintain the pressure put prism eyes, the establishment of a single eye, as, wears glasses to correct the measured △ prism for the pressure should be put prism △. Concomitant strabismus surgery after the remnants of strabismus can also put pressure prism.
strabismus surgery Oct. 3 after measuring the angle oblique to the pressure should be put prism △. Strabismus implicit level of hidden Ramp less than 4 △, hidden vertical ramp is less than 1 △ was no problem as fatigue, for more than 4 △ the level of hidden Ramp, as the fatigue and may increase to one-third of the oblique angle per second I put the pressure prism. For more than 1 △ hidden vertical baroclinic paste △ prism for the vertical angle of view hidden or minus 0.5 △ ~ 1 △, for the elimination of as the muscle fatigue. Such as hidden as a squint, is situated, as a squint, but also to put pressure put on the sub-prism △ eyes, but put his eyes at the end of the prism to the contrary.
1.2.2 diplopia put pressure prism
In addition to the determination of paralytic strabismus caused by diplopia, other causes of diplopia, such as Hunt mechanical check, nerve disease, eye injury, retinal detachment, Portugal hook swollen sclera, Hunt, as well as thyroid disease such as brain injury caused double vision, can be gradually increased so that the prism imaginary as real and as coincidence, the increase at this time is to correct △ prism of the prism as the resumption of △. If severe diplopia to increase the prism too, can increase the reverse prism, and moved to the illusion of perspective, the increase at this time △ prism of the prism is put pressure △.
1.2.3 nystagmus put pressure △ prism to determine the
a compensatory nystagmus in the first place, by turning the head so that the eyes to the head in the opposite direction of rotation to monitor, mitigate or so away nystagmus, which is called in the middle belt zone. At this time can add eyes to the end of the same prism, with its cutting-edge point to the middle, that is still eye-point to the direction of the prism has been added to the compensatory increase in the first place disappear at this time to increase the prism of the pressure that is put △ △ prism of . For example, an earthquake in patients with head to the right side, his eyes still at-eyes on the left side, the increase in the eyes of-the-art prism of the left, that prism at the end of his right eye outward, toward the end of his left eye prism of the prism in the same direction.
nystagmus no compensation in the first place to be wearing different prism, by increasing the collection to reduce or eliminate nystagmus, the eyes of the Canadian prism at the end of the outward, added to reduce the nystagmus or disappear when the pressure is △ prism paste Prism of △.
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