On similar lines, Standard lenses were also attempted, after Gernet and Zorkendorfer in 1982 showed that the average refractive power of natural lens is +23.70D. In the early 1980s, several IDEM (ideal emmetropia) lenses were also attempted, so named as the pre- and post – refraction from them were similar. In the 1970s, after availability of accurate “A” scans, several studies were conducted to establish and publish various theoretical vergence formulas. Fyodorov and co-workers first estimated the optical power of an IOL using vergence formulas in 1967. In 1949, Harold Ridley implanted the first IOL but his patient had a refractive surprise of nearly 20 diopters. When planning for cataract surgery, in order to achieve the desired post-operative refraction, the required power of the intraocular lens (IOL) implant can be calculated if the corneal refractive power, media type, and axial length are known. The refractive power of the eye primarily depends upon the cornea, the lens, ocular media, and the axial length of the eye. The term was originally used by Whewell in the 1800s for calculating life expectancy. 4.2.3.2 Some useful tips for contact procedures:īiometry is the method of applying mathematics to biology.4.2.3.1 Good A-Scan graph: (see figure 1).4.2.1 Patient counselling and requirements.3.5.2.6 Direct measurements of Anterior & Posterior corneal power.3.5.2.1 Gaussian optics and linear regression.3.5.1.4 Intraoperative auto-refraction measurement.3.5.1.1 Clinical History or Calculation method.2.2 Measurements (IOL Master & Lenstar).1.3.2 Refractive State of the Cornea or keratometry (K).For detailed instruction on using update.Manual:$wgDBadminuser and Manual:$wgDBadminpassword.Warning:Įxtensions can install/update their schemas using LoadExtensionSchemaUpdates hook. You can use this parameter to ignore the message and run update.php regardless. "mediawiki/semantic-breadcrumb-links: 1.3.0 installed, ~1.3 required"). skip-compat-checks Skips compatibility checks -skip-external-dependencies when using to let Composer install extensions and their dependencies, you may see an error message saying that there is a mismatch between the installed and required version (e.g. This is useful for non-WMF environments where strict DB permissions allow database updates (which "update.php" performs), but no schema changes (such as adding or dropping tables or indexes, which "update.php" also performs). schema No schema changes are made to the database, but the schema changes are saved to a separate SQL file that can be run.Īllows "update.php" to be run when $wgAllowSchemaUpdates is set to false. noschema All changes to the table structure or table additions are skipped. conf Specifies the config file (the LocalSettings.php file for the specific wiki). force Run this script even if it is disabled by configuration options. Normally update.php purges the objectcache table (generally contains the parser cache and the messages cache), msg_resource and msg_resource_links (these are used for ResourceLoader message caching and are cleared in 1.21 and later) tables in the database, if you don't want to purge this table, use the -nopurge option. ) Script specific parameters -quick skip countdown sequence -nopurge (removed in 1.36) do not purge objectcache table. wiki wikiId update wiki family if database name depends on virtual host, where wikiId - database name (e.g. Generic maintenance parameters -help used to get a prompt of all available script parameters (generic, script dependent and script specific) together with short explanations of their usage. This script offers several parameters (generic, script dependent and script specific) which may be required in some wiki environments. Use the following on Vagrant instances (from within your vagrant ssh). Always backup the database before running the script! Update.php may exit with errors, leaving the database in an inconsistent state. → Web updater From the command line įrom the command line, or an SSH shell or similar: If you do not have access to the command line of your server, then use the web updater to run the update script. Most extensions that require schema updates will say so in their documentation. You should run update.php after each upgrade of MediaWiki or after the update or install of an extension that requires a schema update. Update.php checks if the MediaWiki database schema needs to be updated in order to work with the current version of MediaWiki.
0 Comments
Leave a Reply. |