3M pressure-laminated lenses include: pressure-laminated prisms (PRESS-ON PRISM) and pressure-laminated spherical lenses (PRESS-ON SPHERES).
I. Product design principle
3M PRESS-ON PRISM is made up of a series of shrunken conventional prisms arranged closely and laid flat on a thin plastic sheet using the FRESNEL prism principle. 3M PRESS-ON SPHERES is made up of a series of concentric circles using the aspheric optical design principle. This greatly reduces the thickness of traditional prisms and spherical lenses, and compared to traditional lenses of the same refractive power, 3M pressed lenses are both lighter and thinner, with a thickness of only 1mm for both prisms and spherical lenses, regardless of the refractive power.
Second, the advantages of 3M compression lenses
1, easy to wear, convenient, easy to replace
2, light, thin, beautiful, comfortable
3.Small distortion phenomenon
4, without any binder, vacuum adsorption in the water pressure paste can be
5.High transmittance
6, wide range of product specifications, the maximum degree of pressure paste prism up to 40Δ, the highest degree of pressure paste spherical mirror can reach -14D and +16D respectively.
Three, 3M pressure paste prism configuration methods and precautions
The pressure paste prism can not directly eliminate strabismus, and strive to obtain or maintain binocular monocular function in the oblique position.
1.Strictly grasp the indications, mainly for treatment.
2.Check carefully, after a comprehensive eye examination, focus on the following examinations.
(1) Visual acuity examination: check both eyes separately, if there is nystagmus also check binocular vision (when the head is right, when there is head position)
(2) Eye position check: check the eye position several times, and try to wear the pressed trigeminal lens only after the eye position is stable. Check the distance and near eye position (33cm, 6m) of the two eyes respectively; paralytic strabismus is often different between the left and right eyes; wearing glasses and bare eyes, focus on the wearing glasses
(3) Determine the eye of gaze: paralytic strabismus, paralytic eye gaze or healthy eye gaze? Common strabismus, what is the main eye?
(4) Eye movement examination: to further determine whether the strabismus is common or paralytic.
(5) Compensatory head position: head to the left/right? Facial turn? Jaw elevation/inversion?
(6) Nystagmus: is there an intermediate band?
(7) Diplopia: present or absent, horizontal/vertical?
(8) Nature of gaze: central gaze/paracentral gaze
(9) Monocular function of both eyes
(10) Check the patient’s own eyeglasses: whether they have been worn for too long, children should have their pupils dilated once every six months to one year. Are the frames straight and not skewed? Are there any wear and tear on the lenses?
Four, 3M pressure paste prism treatment of various common diseases of the general principles
Prerequisite: no diplopia and other discomfort after wearing the prism.
1.Common internal strabismus: including secondary internal strabismus, small-angle internal strabismus even after wearing the lens for regulatory internal strabismus, postoperative residual internal strabismus, trigeminal prism adaptation test, etc.
The direction of the trigeminal base: base outward. Trigonometry degree: no apparent strabismus (masking de-masking immobility). Eye selection: two eyes with the same vision, paste any eye, if one amblyopic, paste the healthy eye.
2, surgery, and the need to maintain or establish monocular function in both eyes, you can wear trigeminal prism.
The direction of the bottom of the trigeminal prism: bottom to inward. Trigonometry degree: no apparent oblique. Eye selection: both eyes have the same visual acuity, paste any eye, if one eye is amblyopic, paste the healthy eye.
3, congenital superior oblique muscle palsy: including small vertical strabismus degree, those with compensated head position temporarily without surgery, and those with residual superior strabismus after surgery, head position still exists.
The direction of the trigeminal base: high fundus downward, or low fundus upward. Trigeminal degree: no significant obliquity. Eye selection: try on both eyes separately to see which eye is more comfortable and the head position disappears more completely to determine.
4, other congenital vertical muscle palsy: refer to congenital superior oblique muscle palsy.
5.Nystagmus: those without strabismus and with exact intermediate band (face turned to one side). Including those who are temporarily inoperable and those who have recurrence after surgery.
Orientation of the trigeminal base.
(1) Isotropic: the bottom is opposite to the resting direction, and the tip points to the intermediate band, so that the intermediate band moves from the lateral side to the front.
(2) Anisotropic: the base is outward in both eyes, inducing pooling and reducing nystagmus. Trigonometry: Placement of lenses equal or similar in both eyes, neutralization until the head position disappears or is significantly better, and no strabismus can occur. Eye selection: placing both eyes.
6, adult visual fatigue: including a variety of horizontal and vertical occlusion. The compression lenses can be attached to the full lens or partially to the original lens (above or below) to control looking far or looking close to the occlusion.
The direction of the bottom of the trigeminal lens: determined by the type of obliquity. Trigonometry degree: should be small rather than large, 1/3~1/2 of horizontal occlusion degree, full correction of vertical occlusion or minus 0,5~1 D. Eye selection: place both eyes.
7, acquired III, IV, VI nerve palsy with diplopia: in order to maintain monocularity in both eyes during the muscle recovery period, you can wear pressure-pasted trigeminal lenses. The compression paste lens can be attached to the original lens partially or completely to correct diplopia in a specific gaze direction.
Direction of the trigeminal base: determined by the type of strabismus. Trigonometry degree: to eliminate diplopia. Eye selection: try on both eyes separately.
To determine which eye is more comfortable and acceptable to the patient.
8. DVD: including DVDs with small degrees temporarily without surgery, DVDs with recurrence after surgery, DVDs with obvious horizontal strabismus, DVDs with horizontal strabismus temporarily without surgery, etc.
The direction of the trigeminal base: high fundus downward, or low fundus upward. The degree of trigeminal: after wearing trigeminal lenses alternately cover
Cover the covered eye without obvious descent, or symmetrical descent of both eyes. Eye selection: 1) Placement of the high eye 2) A few patients with a single DVD
The tendency is very prominent, you can also try to convert the gaze eye, that is, in the gaze eye with the bottom up trigeminal, you can use DVD
(3) bilateral DVD, apparently asymmetric, can be in the DVD light eye sticker bottom up prism, sometimes can cause the effect of bilateral mild symmetrical drop, improve a clear drop.
Five, pressure paste prism trial wear time
Corrective head position, DVD, trigeminal adaptation test and other observation time can be relatively long, more than 1 hour or even half a day or longer.
The general common strabismus trial wearing time is within 1 hour.
Adult visual fatigue, wearing glasses to read comfortably without discomfort is sufficient.
Paralytic strabismus can be observed for about 1 hour after wearing the glasses without diplopia.
Sixth, wearing pressure paste trigeminal review time and content
The first time to wear, once a month to review, and later as appropriate, regular review.
Visual acuity, eye position, monocular function of both eyes.
Ask about the wearing situation, check whether the lenses are aging, wear and tear, whether they need to be replaced, etc.
VII. Indications for 3M compression spherical lenses
1.High refractive error
2.Post congenital cataract surgery, lens-less eyes.
3, low vision patients, reading magnification role.
4.Diabetes, temporary refractive error.
5.Refractive parallax.
6.Bifocals.
Eight, 3M pressure paste the maintenance of the lens
1, regular cleaning pressure paste lens. Do not take off the pressure paste lens when cleaning, rinse the lens under a small stream of water, after cleaning still dust, use a soft fine brush to clean the groove of the pressure paste lens.
2. Avoid dusty, dirty and greasy environment as much as possible in use.
3.It is forbidden to use alcohol to scrub the lenses.
4.You can’t scrape or pry the pressed lens with your hand or sharp instrument.
5.If the pressed lens is loose or fallen off, put it into the original lens box or wrap it with spectacle cloth and hand it to the ophthalmologist for treatment.