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Results for “Lens Implantation, Intraocular”

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At least 19 recordsLinked to original sources
PubMed1975

The optical design of intraocular lens implants.

Intraocular lens implants have been around for more than 25 years. On the verge of a major breakthrough to ever widening popularity, there is, however, a general lack of understanding of the pertinent optical principles. A critical comparison is made between this new method and conventional methods of correcting aphakia. From this it appears that the visual needs of the patient are a decisive factor in the selection of the method of correction. Moreover, the full potential of intraocular lens implants can only be realized by appropriate selection of the power of the implant in each situation. To this end, ultrasonic measurement of the ocular axial length is indispensable. The use of standard power lens implants is inadequate. Formulas are presented to make an eye emmetropic or to give it any refractive error. Guidelines are given for the use of these formulas. Two methods for obtaining equal image size in unilateral antiphakia are described.

Aniseikonia↗
PubMed1982

Tinting of intraocular lens implants.

Intraocular lens (IOL) implants of polymethyl methacrylate (PMMA) lack an important yellow pigment useful as a filter in the visual process and in the protection of the retina from short-wavelength radiant energy. The ability to produce a yellow pigment in the PMMA used in IOL implants by exposure to near-ultraviolet (UV) light was tested. It was found that the highly cross-linked material in Copeland lens blanks was tinted slightly because of this exposure. The absorptive properties of lens blanks treated with near-UV light in this way approached that of the absorptive properties of human lenses. This finding shows that it is possible to alter IOL implants simply so as to induce a pale-yellow pigment in them to improve the visual process and to protect the retinas of IOL users.

Color↗
PubMed1990

Hydroxypropyl methylcellulose in extracapsular cataract surgery with intraocular lens implantation: intraocular pressure and inflammatory response.

We studied prospectively the effects of 2% hydroxypropylmethylcellulose (HPMC), instilled in to the anterior chamber during extracapsular cataract extraction with posterior chamber intraocular lens implantation in 122 patients. Significant pressure rise was noted at 12 and 24 hours post-operatively when HPMC was not removed at the end of surgery. This was prevented by washing HPMC from the anterior chamber at the end of surgery, or by using either acetazolamide or a combination of oxyphenbutazone and vitamin C without washing HPMC. There was no difference in intraocular inflammation between controls and the HPMC groups. The group receiving combined oxyphenbutazone and vitamin C had the least, the differences between these two groups being sufficient.

Acetazolamide↗
PubMed1993

Intraocular lens implantation versus no intraocular lens implantation in patients with chronic iridocyclitis and pars planitis. A randomized prospective study.

PURPOSE: The authors studied the safety of intraocular lens (IOL) implantation in patients with uveitis. METHODS: The authors prospectively randomized 26 patients with chronic iridocyclitis (22 patients) or pars planitis (4 patients) to undergo IOL implantation or no IOL implantation at the time of cataract surgery. RESULTS: There was no statistical difference in visual acuity results at 1 year between the two groups. There was a trend toward better visual acuity in patients with chronic iridocyclitis without IOLs. Cocoon-like dense fibrous membranes enveloped the IOL in two patients. CONCLUSION: The authors conclude that IOLs are relatively safe in patients with chronic iridocyclitis but that only a much larger study could determine if the trend toward better visual acuity without an IOL was real.

Adult↗
PubMed1983

Direct vitreous reaction to intraocular lens implants.

Three intraocular lens implants removed during keratoplasty between 1 1/2 and 5 years after implantation revealed attachments of reactive vitreous strands and membranes contained bundles of fibers with associated small bipolar cells, pigment, and blood remnants. Some of the fibrous vitreous strands were wound around the haptics of the implants for firm anchoring. The usual reactive cell membranes on the surface of the implants were interrupted in the areas of the attachment of formed vitreous and vitreous membranes.

Aged↗
PubMed1985

[Measurement of coaxial position in lens implants].

Intraocular lens implantation occasionally causes binocular diplopia resistant to prismatic correction. Present methods of examination cannot determine the cause of this incurable diplopia. Therefore, a new method based on keratometry has been invented to allow qualitative and quantitative analysis of biomicroscopically undetectable decentration of intraocular lens implants producing asthenopic complaints. The present study investigates the type and frequency of intraocular lens decentration relative to the visual axis.

Diplopia↗
PubMed1977

Retinal detachments after intraocular lens implants.

Intraocular lenses are a challenge to the retina surgeon. Forty-three eyes with pseudophakia and retinal detachment were examined. Intracapsular and extracapsular cataract extractions had been performed, and different types of lenses had been implanted. The single most important factor for the successful repair of these pseudophakic detachments was visual access to the retina.

Adult↗
PubMed1991

Survey of the optical quality of intraocular lens implants.

Intraocular lenses (IOLs) from 15 U.S. firms were tested for conformance to the requirements of the American National Standards Institute Z80.7 standard for IOLs. A total of 162 IOLs were tested for resolution, astigmatism, and accuracy of labeled power. Average resolving power was 78% of the diffraction limit, much better than the ANSI minimum requirement which is typically equivalent to 30% of the diffraction limit. This suggests that the ANSI Z80.7 requirement could be significantly tightened with little effect on current production practices. Only one IOL exhibited astigmatism in excess of 0.25 diopter. Differences between measured and labeled power in excess of 0.50 diopter were found in 22 lenses, indicating that accuracy of refractive power may be the most commonly missed optical requirement of the standard.

Equipment Design↗
PubMed2003

[Comparing patients' quality of life after phacoemulsification with intraocular lens implantation with that after extracapsular cataract extraction with intraocular lens implantation].

OBJECTIVE: To Compare the effects of phacoemulsification with intraocular lens implantation (PHACO + IOL) to extracapsular cataract extraction with intraocular lens implantation (ECCE + IOL) on quality of life. METHODS: The study population consisted of 116 patients receiving PHACO + IOL and 93 patients receiving ECCE + IOL. They were interviewed using the quality of life questionnaire, and the clinical outcomes were obtained before surgery and in 1 week, 1 month, 3 months after surgery respectively. RESULTS: Patients receiving PHACO + IOL reported larger benefit in quality of life and all sub-scales than did those receiving ECCE + IOL in 1 week after surgery. Subjects underwent PHACO + IOL showed better improvement in quality of life and two sub-scales (social and mental) than did those underwent ECCE + IOL in 1 month and 3 months after surgery. However, the improvement in other two sub-scales (self-care and mobility) was similar between two surgical groups in 1 month and 3 months after surgery. CONCLUSION: The patients receiving PHACO + IOL reported better and more rapid improvement in quality of life within 3 months after surgery. PHACO + IOL and ECCE + IOL have the same effects on improvement in self-care and mobility. So quality of life in patients receiving PHACO + IOL are better than those of ECCE + IOL.

Aged↗
PubMed1998

Primary intraocular lens implantation for penetrating lens trauma in Africa.

OBJECTIVE: This study aimed to audit the surgical strategy of primary posterior chamber intraocular lens implantation for cases of recent penetrating trauma involving the lens in an African population. DESIGN: Retrospective, noncomparative case series. PARTICIPANTS: Seventy-two cases are reported, including all patients who underwent primary intraocular lens implantation for traumatic cataract extraction performed within 1 month of injury between 1988 and 1996. MAIN OUTCOME MEASURES: Demographic characteristics and follow-up attendance rates are analyzed. Surgical technique and the occurrence of intraoperative and postoperative complications are reported. Visual outcomes are reported with detailed analysis for cases of poor visual outcome. RESULTS: Mean age was 14.3 years (standard deviation = 11.1), 57 (79%) were male and 15 (21%) were female (chi-square = 23.66, P < 0.01). Fifty-eight patients (80%) attended for follow-up with a mean follow-up duration of 14.3 months (standard deviation = 17.3). No demographic or surgical differences were identified between attendees and nonattendees. The posterior capsule had been breached by the trauma in 27 (38%) cases, and 15 of these required anterior vitrectomy. Capsular fixation of the implant was achieved in 49% of patients, the remainder having sulcus fixation. Intraoperative rupture of the posterior capsule occurred in four cases. The only common postoperative complication was acute fibrinous anterior uveitis, which occurred in 29 (40%) patients, and 32% of patients followed up for at least 6 months required secondary posterior capsulotomy. This was more common in younger patients (chi-square = 4.2, P < 0.05). Corrected postoperative visual acuities were available for 51 patients, of which 71% achieved 20/60 or better visual acuity. Patients 6 years of age or younger were less likely to achieve 20/60 (chi-square = 6.61, P = 0.01). CONCLUSIONS: This surgical strategy has proved successful, producing good visual results and causing no sight-threatening complications. Primary posterior capsulotomy may be appropriate for younger patients.

Adolescent↗
PubMed1983

Artificial anterior chamber for the growing of membranes on lens implants.

Intraocular lens implants made of glass and plastic were placed into the lumen of short pieces of clear plastic tubing. These were incompletely closed at both ends with nylon sutures, filled with Healon, and used experimentally as artificial anterior chambers for implantation into the peritoneal space of mice. After 7 days macrophages had been attracted into the chambers, become sessile on the implants, and formed a continuous membrane on their surface. The concept of artificial anterior chambers in experimental and future clinical applications is discussed.

Animals↗
PubMed1986

Posterior chamber intraocular lens implantation--a new forceps to simplify capsular bag fixation.

The case for capsular bag fixation of the Sinsky-Kratz type of posterior chamber intraocular implant lens is presented, and the various methods in use to position implant lenses are outlined. The new forceps are described and the rationale for their adoption and use is given in an illustrated, step-by-step fashion. Their additional use in anterior chamber intraocular lens implantation is mentioned. There is a brief summary of the author's experience with this instrument.

Cataract Extraction↗
PubMed2000

Epilenticular intraocular lens implantation in traumatic cataract with a ruptured posterior capsule.

PURPOSE: To present a case of rapidly progressing traumatic cataract caused by posterior capsule rupture after nonpenetrating ocular injury, as well as a surgical procedure to safely implant the intraocular lens in such a traumatized eye. METHODS: In a 23-year-old man with traumatic cataract and posterior lens capsule rupture, a one-piece polymethylmethacrylate IOL was implanted before cataract extraction into the ciliary sulcus in front of the cataractous lens. Subsequently, the cataract was removed by pars plana lensectomy. RESULTS: The surgery and postoperative course were uneventful. Postoperative visual acuity was 20/20. CONCLUSION: We present a method of intraocular lens implantation in cases of rapidly progressing traumatic cataract caused by posterior capsule rupture after a blunt ocular trauma.

Adult↗
PubMed1975

The simple approach to intraocular lens implantation.

The Copeland intraocular lens implant combined with the intracapsular cataract extraction technique is relatively easy to do when first starting intraocular lens surgery. It does not require switching over to the extracapsular technique or using suture material to secure the implant. It can be done with a Loupe by those who do not use a microscope. The lens is hinged securely in the plane of the pupil and is immobile even with extensive eye movement. The planned implantation should be cancelled if the eye is not soft with a shrunken vitreous body immediately after the lens is extracted. The talked about complications of uveitis and posterior lens membrane may be avoided by the use of steroids and No. 10-0 Ethylon or No. 9-0 silk sutures. After doing, over the past two years, 55 Copeland iris plane lenses combined with intracapsular cataract extraction, I find it to be a relatively simple procedure. It is certainly easier than using intraocular lenses that require either the remnants of lens cortex or capsule for implant fixation, or the tying of No. 10-0 Ethylon suture inside the anterior chamber.

Age Factors↗