Signs of IOL degradation develop over a long period of time (3-6 years, in our experience) and mostly involve the anterior surface of the lens optic. Ocular comorbidity, glaucoma in particular, as well as other surgery and/or therapeutic treatment following IOL implantation may contribute to its opacification. Analysis of published data and own observations suggest that hydrophobic IOLs should be preferred in patients with concomitant diseases, especially diabetes mellitus. Granular deposits, if accumulate, may lead to deformation of the lens optic, as confirmed by the bowl-like impression in one of the explanted hydrophilic IOLs.
The two samples represent two stages of a single process. The early stage is associated with newly formed HA crystals that are unable to cause any significant changes to the lens surface. However, as spherocrystals grow, they exert a crystallization effort that moves their growth centers apart with subsequent lens rupture and deformation. Crystal morphology undergoes dynamic changes: while primary (newly formed) crystals are sheaf-like, mature are spheres. A growing HA is non-stoichiometric. Zinc abundance accounts for appearance of its separate mineral phase. Hydrophilic properties of acrylic polymer determine its high affinity for HA crystals. Hydrophobic coating (sample no.1) does not completely prevent lens opacification due to mineral deposits on its surface.
In cases of impossibility or inaccessibility of optical biometry, measurements taken with an A-scan device set at 1000 m/s are sufficient. The true AL of an eye with silicone oil tamponade falls somewhere between the values obtained with 1000 m/s ultrasound and IOL Master in the 'silicone-filled eye' mode.
66.061The possibility of obtaining stable reforming catalyzate with a benzene content of less than 1 wt. % was demonstrated by mathematical modeling. Two new versions of separation of benzene-forming components from the reaction mixture between the second and third levels were created. In comparison to the standard process, the first version ensures a benzene content in the reformate at the level of 0.01 wt. % with a 12% decreases in its yield, and the second version produces a benzene content at 0.47 wt. % with a 2.9% increase in the yield of reformate. The proposed versions are useful in production of export automotive gasoline that satisfies the Euro 2000 requirements.
РЕЗЮМЕ В обзоре представлены основные патогенетические механизмы развития катаракты в авитреальном глазу и анатомо-функциональные изменения глаза в состоянии авитрии. Проанализированы и обобщены особенности поведения авитреального глаза при факоэмульсификации катаракты и оперативно технические приемы, используемые при возникновении специфических авитреальных феноменов.
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