Intraocular Lenses
Mostrando 13-24 de 64 artigos, teses e dissertações.
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13. Diffractive multifocal intraocular lens implants for unilateral cataracts in prepresbyopic patients.
Multifocal intraocular lenses allow pseudophakic patients to obtain good near and distance visual acuities without an additional near correction. We report our experiences in implanting diffractive multifocal intraocular lenses in prepresbyopic patients with acquired unilateral cataracts and assess their postoperative visual acuities and stereoscopic vision.
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14. Adherence of Staphylococcus epidermidis to intraocular lenses.
We have demonstrated, with an in vitro model, that Staphylococcus epidermidis is able to colonise intraocular lenses. Adherent organisms were quantitated by light microscopy, scanning electron microscopy, and viable counting. Bacterial adherence was associated with production of a polysaccharide glycocalyx. Organisms which were attached to the lenses were re
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15. Bacterial contamination of intraocular lens surgery.
One hundred sterile intraocular lenses were placed on the external eye of 50 patients during cataract surgery. Half of the specimens were cultured for bacteria, the other half were examined under the light microscope after fixing and staining. A bacterial contamination rate of 26% was recorded. This is significantly higher than that found in conjunctival swa
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16. Histopathological findings in necropsy eyes with intraocular lenses.
The histopathological findings in five post-mortem eyes with anterior chamber and iris fixation intraocular lenses (IOLS) are discussed. The interval between lens insertion and death ranged from 3 1/2 to 52 months. Clinically the lenses were well tolerated and the surgery was considered to be successful. In one case a vitrectomy was required. Prominent histo
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17. The SRK regression formula in calculating the dioptric power of intraocular lenses.
One hundred and seventy one eyes with intraocular lenses were studied to compare the predictive accuracy of the Fyodorov and Van der Heijde theoretical formulae of the Sanders-Retzlaff-Kraff (SRK) regression formula. The SRK regression formula was the most accurate. Our personal calculations of the A constants of this formula are given for several types of i
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18. A comparison of 141 polymacon (Iogel) and 140 poly(methyl methacrylate) intraocular lens implants.
In a prospective controlled trial 290 consecutive patients were randomly allocated a polymacon or a poly(methyl methacrylate) (PMMA) intraocular lens. Early Treatment of Diabetic Retinopathy Study (ETDRS) acuity charts gave similar results with both lenses. However Pelli-Robson contrast sensitivity charts gave a better result with PMMA lenses. Polymacon lens
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19. Determination of the power of a convex-plano intraocular lens in situ from the dioptric keratometer reading of its front surface: extension table for the Javal-Schiøtz ophthalmometer.
The size of the reflex image of keratometer mires can be used to determine the power of an intraocular lens (IOL) inside the eye (in situ). The dioptric scale reading from the front surface of a convex-plano intraocular lens in cases of unknown power is compared with computed values. The accuracy of the method is demonstrated in a series of patients with kno
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20. Bifocal intraocular lenses.
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21. Current status of intraocular lenses.
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22. Fechner's Intraocular Lenses
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23. Intraocular Lenses
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24. Optimal postoperative refraction for good unaided near and distance vision with monofocal intraocular lenses.
Forty five eyes with up to 2 dioptres of myopic astigmatism and up to 1 dioptre sphere either plus or minus following cataract extraction and implantation of a monofocal intraocular lens were examined to assess their unaided visual acuities. Forty three percent were able to see 6/12 and N8, and 60% were able to see 6/12 and N10. Subjects with between 1 and 2