本文選題：老視　切入點(diǎn)：發(fā)生機(jī)制　出處：《太原理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：老視是隨著年齡的增長而出現(xiàn)的視近困難,是一種正常的生理現(xiàn)象并非屈光不正。人人都會(huì)發(fā)生老視,無論是正常眼、近視眼還是遠(yuǎn)視眼,當(dāng)達(dá)到一定年齡就會(huì)發(fā)生老視,只是發(fā)生的時(shí)間不同而已。隨著中國向老齡化社會(huì)的邁進(jìn),老視人群的數(shù)目逐漸增多,老視的問題亟待解決。 晶狀體作為眼球屈光系統(tǒng)中唯一具有調(diào)節(jié)能力的屈光間質(zhì),其生物力學(xué)性能的改變與老視的形成有著密切的聯(lián)系。因此,對晶狀體生物力學(xué)性能的研究有利于更好地認(rèn)識老視的發(fā)生,同時(shí)可為探索老視的物理及化學(xué)治療方法提供檢測依據(jù)。 本文通過對不同年齡段兔眼晶狀體進(jìn)行壓縮和拉伸實(shí)驗(yàn)得出： (1)隨著年齡的增長,兔眼晶狀體的重量、厚度、赤道直徑以及最大壓縮載荷都有所增大。 (2)在壓縮實(shí)驗(yàn)中,定義了名義應(yīng)力、名義應(yīng)變、名義壓縮模量,并且在彈性范圍內(nèi)算出了3月、6月、9月兔眼晶狀體的名義壓縮模量為(1.21±0.19)kPa、(2.62±1.13)kPa、(6.46±2.92)kPa,兔眼晶狀體的名義壓縮模量隨年齡非線性增大。 (3)在拉伸實(shí)驗(yàn)中,通過對兔眼晶狀體施以拉伸載荷,兔眼晶狀體赤道直徑的變化隨著年齡的增大而減小,名義拉伸模量隨著年齡的增長而增大。 (4)因此,隨著年齡的增長,兔眼晶狀體的剛度逐漸增大,變形能力減弱。
[Abstract]:It is a normal physiological phenomenon that is not ametropia. Everyone has a presbyopia. Whether it is normal, myopia or hyperopia, it will happen when we reach a certain age. As China moves toward an aging society, the number of presbyopia is increasing, and the problem of presbyopia needs to be solved. The change of biomechanical properties of lens is closely related to the formation of presbyopia as the only refractive stroma in the refractive system of eyeball. The study on the biomechanical properties of lens is helpful to better understand the occurrence of presbyopia and to provide the basis for exploring the physical and chemical therapy of presbyopia. In this paper, we studied the compression and stretching of rabbit lens in different ages. 1) the weight, thickness, equatorial diameter and maximum compression load of rabbit lens increased with age. In the compression experiment, the nominal stress, nominal strain, nominal compression modulus, The nominal compression modulus of rabbit lens in March, June and September was calculated to be 1.21 鹵0.19 KPA 2.62 鹵1.13 KPA 6.46 鹵2.92 KPA, and the nominal compression modulus of rabbit lens increased with age nonlinearity. 3) in the tensile experiment, the equatorial diameter of the rabbit lens decreases with age, and the nominal tensile modulus increases with age by applying tensile load to the rabbit lens. Therefore, the stiffness and deformability of rabbit lens increased with age.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：R77

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本文編號：1603807