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Contact lenses. to correct refractive errors of the eye; a little invasive. Phoropter. used in refraction testing. Tonometers. used to determine the intraoccular pressure (IOP) - useful in glaucoma; video link for various types of tonometers. Speculum: to keep the eyes open during any operation. Universal eye speculum.
A sewing needle, used for hand- sewing, is a long slender tool with a pointed tip at one end and a hole (or eye) to hold the sewing thread. The earliest needles were made of bone or wood; modern needles are manufactured from high carbon steel wire and are nickel - or 18K gold -plated for corrosion resistance. High-quality embroidery needles are ...
A sewing machine needle is a specialized needle for use in a sewing machine. A sewing machine needle consists of: [1] shank - clamped by the sewing machine's needle holder. shoulder - where the thick shank tapers down to the shaft. shaft - a length suitable for driving the eye and thread through the material and down to the bobbin.
Vibrating shuttle. A vibrating shuttle is a bobbin driver design used in home lockstitch sewing machines during the second half of the 19th century and the first half of the 20th century. It supplanted earlier transverse shuttle designs, but was itself supplanted by rotating shuttle designs.
Couching (ophthalmology) "Couching for cataract"; Wellcome Collection illustration of Indian doctors performing the technique. Couching is the earliest documented form of cataract surgery. It involves dislodging the lens of the eye, thus removing the cloudiness caused by the cataract. Couching was a precursor to modern cataract surgery and pars ...
Stiletto. A stiletto (plural stilettos[1]) is a specialized dagger with a long slender blade and needle-like point, primarily intended as a thrusting and stabbing weapon. [2][3] The stiletto blade's narrow cross-section and acuminated tip (that is, a tip which tapers to a sharp point) reduce friction upon entry, allowing the blade to penetrate ...
In 1753, Samuel Sharp performed the first-recorded surgical removal of the entire lens and lens capsule, equivalent to what became known as intracapsular cataract extraction. The lens was removed from the eye through a limbal incision. [1] At the beginning of the 20th century, the standard surgical procedure was intracapsular cataract ...
The term " eye of a needle " is used as a metaphor for a very narrow opening. It occurs several times throughout the Talmud. The New Testament quotes Jesus as saying in Luke 18:25 that "it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God" (Jesus and the rich young man); This is repeated in ...