Corneal contact lenses can effectively eliminate spherical aberration, reduced field of vision, and unequal image defects of frame glasses, and can also correct some of the irregular astigmatism caused by corneal surface deformation.
Fitting frame glasses
Indications
1, correction of refractive error.
2, correction of presbyopia.
3, for safety protection, such as anti-ultraviolet, bulletproof, fireproof, anti-biochemical, anti-microbial pollution, impact resistance, etc.
4, some people need to wear frame glasses for the pursuit of fashion.
Contraindication】
No special contraindications.
Preparation before wearing
1, wearing frame glasses should have the following equipment: vision table, pupil distance meter, pen flashlight, frame glasses special adjustment tools.
2.The wearer obtains the correct corrective prescription, including the pupil distance.
3, According to the requirements of the wearer to choose a good frame.
【Operation and usage】.
1.The lens cutting edge system is done according to the prescription requirements into the mirror.
2.Adjust the frame.
3, check whether the two eyeglass lenses are in the same plane. The angle between the two sides should be equal, and the intersection point should be in the center of the frame.
4, let the wearer put on the glasses and then evaluate and adjust.?
(1) Horizontal shape adjustment: Observe the reference points associated with the eyebrows and pupils, consider the type of lens, if it is a bifocal lens, check the position of the optical center if it is a single-light lens; if it is a gradient lens, check the position of the optical center if it is a gradient lens
(2) check the angle of inclination: the angle between the frame surface and the vertical surface, generally 10 ° forward inclination, when fitting progressive lenses forward inclination angle range in 10 ° -12 °.
(3) Check the angle of the frame: the angle between the frame surface and the vertical surface is generally 10°.
(4) Confirm that the curved part of the lens foot matches the shape of the wearer’s head.
5, wearing glasses optometry. After wearing the lenses to adapt, check the degree adjustment of the sun sac stool Γ (16) deceiving sacral prayer ∩ jurisdiction small 0, 50D.
【Post-wearing treatment
If the wearer has any discomfort after wearing the lens, he/she should return for a review in time to find out the cause and deal with it properly.
Precautions]
1, wearers should maintain the cleanliness of the frame glasses.
2, wearers of frame glasses should pay attention to safety, to prevent external force damage glasses.
Fitting soft corneal contact lens
Indications
1, correction of refractive error. Wearing corneal contact lenses can effectively eliminate the spherical aberration of frame glasses, field of vision reduction, unequal image and other defects, and can correct part of the irregular astigmatism caused by the deformation of the corneal surface.
2, age 16-38 years old is more appropriate.
3, refractive error >1,50D, astigmatism <1,50D is more appropriate.
4, the corneal K reading is 41, 00-46, 00D.
Contraindications
1, low tear secretion, severe conjunctivitis, keratitis and other patients.
2, diabetes, arthritis and other systemic diseases with reduced resistance and neurotic patients.
3.Environment with high exposure to sand, dust and volatile acids and bases.
4.Patients with poor personal hygiene and compliance.
5.The following are relative contraindications.
(1) One-eyed person.
(2) Functional pregnancy and menopausal women.
(3) Patients with thyroid-related eye disease.
(4) Children.
Preparation before fitting
1. Understand the patient’s eye history, history of corneal contact lens wear, reasons for wearing corneal contact lenses, work and living environment.
2.Checking the search for the Pyeongyeong delighted bud stringing fei! (5) enjoy the foothold (13) Pioneer: Di (ix) polyester Guo quietly put the goblet in fear
3.Conjunctival and corneal routine examination of the cupboard
4.Tear fluid examination. Perform tear secretion test and determine the tear film rupture time.
5.Measure corneal curvature and choose the base arc of corneal contact lens.
6.Refractive examination.
7.Do corneal endothelial microscopy hiss tad quietly if necessary
【Operation and use】
1.Patients and health care workers wash their hands and cut their nails short.
2. Check the lens parameters before sealing the lens package. Clean the used lenses thoroughly.
3. Wear corneal contact lenses.
(1) Method 1: The operator stands on the right side of the patient, places the lens on the right index finger, pulls the left index finger away from the upper lid and the right middle finger away from the lower lid, and gently places the lens on the cornea.
(2) Method 2: Separate the upper and lower lids with the left index finger and thumb, hold the lens with the index finger of the right hand and gently place it on the cornea.
4.Let the patient adapt to wearing the lens for about 15min.
5.Lens wearing test, according to the standardized optometry procedure, under the state of wearing corneal contact lens for primary sensory optometry, in the order of right eye first and then left eye.
6.Lens wearing test, using the slit lamp diffusion illumination method to check the center position and stability of the lens in the eye, lens coverage, lens mobility in the eye and the patient’s subjective perception of lens wearing. The test is performed in the order of right eye first and then left eye.
7.Adjustment of lens parameters according to the evaluation of lens fitting and the results of the wearing lens examination, and determination of the final prescription of the corneal contact lens.
8.Give relevant care solution and instruct the care procedure.
9.Lens removal. With eyes wide open and eyes looking straight ahead, press the edge of the upper lid with the right index finger, then press the edge of the lower lid with the left index finger and pull it tight; or do the opposite, make the lower end of the lens cock forward out of the lower lid, then gently push the lens down with the right index finger.
Post-wear treatment
1. Clean and disinfect the contact lenses regularly according to the requirements of using corneal contact lenses.
2.The early period of wearing corneal contact lenses should be reviewed regularly, especially hard lenses. From the beginning of the lens (wear a few hours a day) to the continuous wearing of lenses into the weekly review. After 3 times in a row, review once a month.
Note】
1, left and right spectacle lenses should not be confused.
2, soft and hard corneal contact lens wearing method is basically the same. However, soft corneal contact lenses should be clearly identified before wearing.
3, can not rub the eyes to avoid scratching the cornea or cause the lens to deviate from the normal position and fall off.
4.Replace the lenses in time according to the specified lens life.
5.When symptoms such as eye redness and tearing occur during the process of wearing, it should be promptly reexamined.
6, corneal contact lens is a non-implantation of artificial organs, its fitting by professional and technical personnel in strict accordance with the rules of corneal contact lens treatment.
Fitting of gas permeable rigid corneal contact lenses (RGP)
Indications
1, general myopia, hyperopia, astigmatism, refractive error.
2, high myopia, high hyperopia, high astigmatism, irregular astigmatism.
3.Cone cornea and other corneal degenerative diseases and corneal scar caused by high irregular astigmatism.
4, ocular trauma, lens-free eye, iris-free eye.
5.Refractive abnormalities after corneal refractive surgery or after corneal transplantation.
6, control and treatment of adolescent myopia.
Contraindication】
1, the same as the soft corneal contact lens wear contraindications.
2, often engaged in strenuous sports.
3, police, firefighters and other special occupations.
Preparation before wearing]
The same as the soft corneal contact lens before wearing preparation.
Operation and use method
1, choose the type of RGP lens, including material, oxygen permeability and design. Then select the diameter and base arc of RGP according to the radius of corneal curvature and prepare for trial wear.
2. After wearing the lens for 30-50 min and waiting for tear stability, we will evaluate the fit status, including central positioning, mobility, and fluorescein staining image. Repeatedly adjust the base arc and diameter of the lens, repeatedly assess until a good fit is acceptable to both the patient and the doctor, then make additional corrections to determine the refraction and issue a complete prescription for RGP lenses.
3. Before the formal wearing of the lenses, the patient should be instructed and trained in the use of the lenses.
(1) Introduce the use method and precautions.
(2) Guidance on wearing lenses: trim nails and wash hands before wearing lenses. Clean the lens surface with daily cleaning solution. Use running water from the faucet or salt water to clean deposits from the lens surface. Apply drops of wetting solution to the lenses. Place the lens on the fingertip of the index or middle finger. Instruct the patient to look upward. Grasp the patient’s lower eyelid firmly with the middle or ring finger of the hand holding the lens. Touch the patient’s lower eyelid as close to the edge of the eyelid as possible. Instruct the patient to look down and grasp the patient’s upper eyelid with the thumb or index finger of the other hand. Place the lens as close to the patient’s eye as possible, instructing the patient to look straight ahead and maintain direct vision, and gently and quickly bring the lens closer to the center of the cornea. Once the lens is attached to the cornea, gently relax the lower eyelid. Gently relax the upper eyelid so that the lens stays in the center of the cornea. Inexperienced wearers may feel discomfort because the edge of the lens can be felt. Patients can be advised to close their eyes and gaze downward, which can reduce the discomfort.
(3) Removal instruction: Instruct the patient to look straight ahead. Using the fingertips of the index fingers or thumbs of both hands, place them on the edges of the patient’s upper and lower eyelids at the 12 o’clock and 6 o’clock positions of the lens. Press the eyelid so that the edge of the eyelid lies just outside of the edge of the lens. Do not flip the eyelid or allow the edge of the lens to slip under the eyelid during this process. Gently press the lens outward toward the eyeball. Move the upper and lower eyelids closer to each other to press out the lens until one edge of the lens comes out of the anterior surface of the cornea. Continue to move the upper and lower eyelids closer to each other until the entire lens is released.
(4) Lens repositioning: If the lens is eccentric after wear, the lens should be repositioned. The patient is instructed to push the eyelids apart to find the position of the deviated lens in the eye without turning the eyes (gaze). The patient is instructed to gaze in the opposite direction of the deviated lens. Two index fingers are placed on the edge of the eyelid and the lens is gently pushed with the eyelid in the direction of the cornea (taking care not to touch the lens itself with the fingers during this process). If the lens is attracted to the eye, press the sclera outside the edge of the lens with the eyelid to prevent the lens from attaching. As the lens approaches the iris, relax the control of the lens and instruct the patient to slowly turn the eye toward the lens. The lens can automatically return to the center of the cornea.
4. Make a daily schedule of lens wear and review.
Post-wear treatment
1-Clean and disinfect the contact lenses regularly according to the requirements of the corneal contact lenses used.
2- Regular review should be conducted. From the beginning of wearing the lens (wearing a few hours a day) to enter the continuous wearing lens 1 time per week. After 3 times in a row 1 time a month to review
【Caution】
1, the right eyeglass lens should not be confused.
2. Do not rub your eyes hard to avoid scratching the cornea or causing the lens to deviate from its normal position and fall off.
3.Replace the lenses in time according to the specified lens life.
4.When symptoms such as eye redness and tearing occur during the wearing process, timely review should be made.