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Dracaena trifasciata is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo. It is most commonly known as the snake plant, Saint George's sword, mother-in-law's tongue, and viper's bowstring hemp, among other names. [2] Until 2017, it was known under the synonym Sansevieria ...
Snake plant, Dracaena (formerly Sansevieria) trifasciata, is known as one of the toughest and most common houseplants. Aloe spp. including Aloe vera; Cactaceae (cacti) Epiphyllum (orchid cacti) Mammillaria; Opuntia (paddle cacti, including the prickly pear) Zygocactus (Christmas cactus) Gymnocalycium mihanovichii (chin cactus) Ceropegia woodii ...
•Near vision-do-; to determine visual acuity of near vision ••Jager's chart-do- ••Printer's types of N series-do- ••Snellen's near chart (1/17th reduction of distant chart)-do-; standard chart of alphabets; video link •Colour vision: to test colour vision ••Ishihara's chart: to determine the type of colour blindness ...
Dracaena aletriformis. Dracaena acaulis Baker; Dracaena acutissima Hua; Dracaena adamii Hepper; Dracaena aethiopica (Thunb.) Byng & Christenh. Dracaena afromontana Mildbr.; Dracaena ajgal (Benabid & Cuzin) Rivas Mart., Molero Mesa, Marfíl & G.Benítez
Dracaena (/ d r ə ˈ s iː n ə / [2]) is a genus of about 200 species of trees and succulent shrubs. [3] The formerly accepted genera Pleomele and Sansevieria are now included in Dracaena . In the APG IV classification system , it is placed in the family Asparagaceae , [ 4 ] subfamily Nolinoideae (formerly the family Ruscaceae).
When testing at near, the patient is to fixate on light source at 33 cm, which is held at eye level. When testing at distance, the patient is to fixate on a light source at 6m. Patient is instructed to fixate on the light source with both eyes opened. The Maddox rod is then placed over the fixating eye.
Sansevieria ehrenbergii in habitat.. Sansevieria is a historically recognized genus of flowering plants, native to Africa, notably Madagascar, and southern Asia, now included in the genus Dracaena on the basis of molecular phylogenetic studies.
Perimetry or campimetry is one way to systematically test the visual field. [1] [failed verification] It is the systematic measurement of differential light sensitivity in the visual field by the detection of the presence of test targets on a defined background. Perimetry more carefully maps and quantifies the visual field, especially at the ...