6 A 0 {j 56 A 0 {j 5
五、發明說明（ 發明範疇 本發明關於隱形眼鏡。更明確地說，本發明提出之 隱形眼鏡將配戴者之角膜形狀納入鏡片之後表面使鏡片 相對於眼睛之取向穩定。 5 10 15 經濟部智慧財產局貝工消费合作社印製 20 25 發明背景 習知對於某些光學缺陷之矯正能藉由對一隱形眼鏡 之一或多個表面賦予非球面矯正特性（例如柱面、雙焦 或多焦特性）而達成D使用具備此等特性之隱形眼鏡的 不可預知問題在於鏡片在眼睛上作用之同時必須維持於 一指定取向。然而’鏡片會因眨眼以及眼瞼和淚液運動 而在眼睛上轉動。 β又叶為維持眼上取向（〇n_eye orientation；)之鏡 片通常為兩大類。其中—類利用稜鏡分光穩定（prism stabi 1 i zat i on )維持鏡片取向。稜鏡分光穩定法之實例 包括使鏡片之前表面相對於後表面偏心，分光平衡，加 厚鏡片下緣，使鏡片支撐於下眼瞼上，在鏡片表面上形 成凹陷或隆起’及對鏡片邊緣截頭。 第二類為動態穩定鏡片，其利用眼瞼的運動維持鏡 片取向。動態穩定法包括在兩對稱橫臥區域縮減鏡片外 表面厚度，加厚水平中心轴内之兩向外區域，及減薄（或 片薄）鏡片之頂部和底部區域。 習知維持鏡片取向之方法受困於一些缺點，其中包 括實現此等方法之鏡片需要專門的加工製程且配戴起來 不舒服，且習知方法並非很有效。因此，需要一種克服 良紙張尺度適用中®因冢標竿（CNS)i{4規格⑽x 297公爱 (請先閱讀背面之注意事項再填寫本頁) 我-----：-!1 訂------I I ^ 464605 A7 ____B7____五、發明說明（>) 部分上述缺點之維持角取向方法。 圖式簡單說明 圖1顯示一習知軟式隱形眼鏡在一角膜上之剖面放 5 大圖。 圖2顯示一本發明隱形眼鏡在一角膜上之剖面放大 圖。 10 15 經 濟 部 智 慧 財 產 局 貝 工 消 f 合 作 社 印 製 20 25 發明及較佳實施例詳細說明 本發明發現可藉由將鏡片配戴者之角膜形狀納入鏡 片之凹面或後表面而獲得一旋轉穩定隱形眼鏡。本發明 提出一種眼上鏡片穩定之有效方法及實現此方法之鏡 片，其不需要任何專門的軸外加工即能生產。此外，本 發明提出一種隱形眼鏡，其配戴起來比習知穩定隱形眼 鏡舒適。 在一實施例中’本發明提出一種製造旋轉穩定隱形 眼鏡之方法’其本質上包含.a)判定一角膜之形狀；及 b)形成一鏡片本質上包含一凹面與該肖膜之形狀相符。 在另一實施例中’本發明提出一種隱形眼鏡，其本 質上包含一隱形眼鏡具有一凸面和一凹面，該凹面本質 上包含一形狀與一角膜之形狀相符。 文中"相符（corresponding，一詞意指鏡片凹面 之一部分或全部大致可疊加於鏡片配戴者的角膜上。較 佳來說’在本發明之鏡片中，後表面之中央部分與角膜 形狀相符。與此中央部分相符之角膜部分為鏡片在眼睛 (請先閱讀背面之注意事項再填寫本頁) d646〇5 A7V. Description of the invention (Scope of the invention The present invention relates to contact lenses. More specifically, the contact lens proposed by the present invention incorporates the shape of the wearer's cornea into the rear surface of the lens to stabilize the orientation of the lens relative to the eye. 5 10 15 Wisdom of the Ministry of Economy Printed by the Bureau of Shellfish Consumer Cooperatives 20 25 BACKGROUND OF THE INVENTION It is known that the correction of certain optical defects can be achieved by imparting aspherical correction properties (such as cylindrical, bifocal, or multifocal properties) to one or more surfaces of a contact lens The unpredictable problem of using D with contact lenses with these characteristics is that the lens must maintain a specified orientation while acting on the eye. However, 'the lens will rotate on the eye due to blinking and eyelid and tear movement. There are usually two types of lenses for maintaining eye orientation (o n_eye orientation;). Among them-the category uses prism stabi 1 i zat i on to maintain lens orientation. Examples of the method of spectroscopic stabilization include making lenses The front surface is eccentric relative to the rear surface, and the light is balanced. The lower edge of the lens is thickened so that the lens is supported on the lower eyelid. The formation of depressions or bulges on the lens surface and frustration of the lens edges. The second type is dynamic stabilization lenses, which use the movement of the eyelids to maintain the lens orientation. The dynamic stabilization method includes reducing the thickness of the outer surface of the lens and thickening it in two symmetrical horizontal areas. The two outward regions within the horizontal central axis, and the top and bottom regions of the thinned (or thinned) lens. Known methods of maintaining lens orientation suffer from a number of disadvantages, including the need for specialized processing of lenses that implement these methods The process is uncomfortable to wear, and the known method is not very effective. Therefore, there is a need to overcome the good paper standards in the application ® Because of the mound rod (CNS) i {4 specifications ⑽ x 297 public love (please read the precautions on the back first) (Fill in this page again) I -----:-! 1 Order ------ II ^ 464605 A7 ____B7____ V. Description of the invention (>) The above-mentioned disadvantages of maintaining the angle orientation method. 1 shows a large cross-section of a conventional soft contact lens on a cornea. Figure 2 shows an enlarged cross-sectional view of a contact lens of the present invention on a cornea. 10 15 Shelley, Intellectual Property Bureau, Ministry of Economic Affairs f Cooperative printed 20 25 Invention and preferred embodiments detailed description The present invention has found that a rotationally stable contact lens can be obtained by incorporating the shape of the cornea of the lens wearer into the concave or rear surface of the lens. The present invention proposes a lens above An effective method for stabilization and a lens implementing this method can be produced without any special off-axis processing. In addition, the present invention proposes a contact lens that is more comfortable to wear than conventional stable contact lenses. In one embodiment 'The present invention proposes a method for manufacturing a rotationally stable contact lens' which essentially includes: a) determining the shape of a cornea; and b) forming a lens which essentially includes a concave surface that conforms to the shape of the Xiao film. In another embodiment, the present invention proposes a contact lens, which essentially comprises a contact lens having a convex surface and a concave surface. The concave surface essentially comprises a shape corresponding to the shape of a cornea. The term " corresponding (corresponding) means that part or all of the concave surface of the lens can be approximately superimposed on the cornea of the lens wearer. Preferably, in the lens of the present invention, the central portion of the rear surface matches the shape of the cornea The corneal part corresponding to this central part is the lens in the eye (please read the precautions on the back before filling this page) d646〇5 A7
經濟部智慧財產局貝工消費合作社印製 五、發明說明（>) 上使用時所覆蓋的部分。力鉍处成Μ丄 在較佳實施例中，鏡片之一Φ 央部分為以鏡片中心為中、、 Τ 為中〜之約8公釐至1 0公釐直徑範 圍。 在本發明方法之第一步驟中，判定將要配戴所生產 鏡片之人的角膜形狀。角膜形狀可藉由任何習知方法判 定’其中無實例地包括以—角膜形貌m (⑶rneai topographer)或視訊角骐鏡（c〇rneal vide〇 keratoscope)觀察角膜。任何習知角膜形貌資料攫取方 法皆可使用。適當之方法非侷限性包括使用莫阿效應技 術（Moire technique )，使用市售角膜形貌測量裝置等 等及其組合。 為了利用形貌資料造形一鏡片，該資料經數學方式 轉換成在角膜之平均球面上下的高度（elevat丨〇n )然後 該高度資料轉換成一網格圖案。該網格圖案可為一與可 利用電腦數字控制車床、銑床或數元可定址裝置對鏡片 後表面或鏡片模具或嵌入物加工之機構相符的直線、極 共心、或螺旋格式。另一種選擇，鏡片表面可利用一可 程式規劃雷射燒钱裝置（laserablationdevice)加工 或車削成形。 本發明之鏡片可為硬式或軟式隱形眼鏡。較佳來 說，此等鏡另為軟式隱形眼鏡。本發明之鏡片可具有納 入凸面（前表面）、凹面（後表面）或兩表面之多種橋正 光學特性的任意特性。舉例來說，鏡片可具有球面、非 球面、雙焦、多焦、棱鏡分光、或柱面橋正中之任意一 或多種矯正。本發明可在至少有一矯正特性要求鏡片相 5 10 15 20 25 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先Μ讀背面之注意事項再填寫本頁) 464605 A7 -------B7_____ 五、發明說明（if ) 對於眼睛之眼上取向維持穩定的鏡片中尋得其最大效 用。在一較佳實施例中，本發明之鏡片為一複曲面軟式 隱形眼鏡，亦即具有一矯正配戴者散光之柱面光學表面 (或光焦度）的軟式隱形眼鏡。 5 在一更佳實施例中，該鏡片為針對一特定鏡片配戴 者定製之鏡片，例如一定製之形貌配合隱形眼鏡。此等 鏡片可藉由利用目鏡光學波前測量提供，此等測量例如 利用一父又柱面像差測量儀（crossed cylinder aberroscope )〔一種經由點分佈或線分佈測量目鏡調變 10 傳遞函數（Modulation Transfer Function )之裝置〕 或是利用測量、估計、内插或計算目鏡光學波前之任何 類似裝置的輸出實行。目鏡光學波前資訊涉及眼睛之光 學組分’包括角膜，晶狀體，眼睛元件之系統長度、傾 度、偏心度，非對稱不規則性及非球面性。 15 達成總目鏡波前像差矯正所需之鏡片表面高度或斜 率變化可僅施行於凹面上、僅施行於凸面上或二者之組 合。所需表面高度或斜率變化會考慮到配合及矯正角膜 形貌之不規則性所需的高度變化。就一軟式隱形眼鏡而 言，由於軟式鏡片包覆於角膜之基本形狀，由角膜形貌 20測繪及目鏡波前像差判定之總和高度變化可僅應用於凸 面、僅應用於凹面、或二者之組合。 在定製之形貌配合鏡片較佳實施例中，習知的球面-柱面處方資訊亦可用於設計造形鏡片。此資訊包括視遠 球面光焦度’視遠散光柱面光焦度和轴線，且必要時包 25 括視近光焦度。此資訊可利用習知主觀折射技術判定。 本紙張尺度適用中囤國家標準<CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)Printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. The part covered by the invention description when used. The force bismuth is formed into M 丄. In a preferred embodiment, the Φ center part of one of the lenses is about 8 mm to 10 mm in diameter with the center of the lens as the center and T as the middle. In the first step of the method of the present invention, the shape of the cornea of the person who will wear the produced lens is determined. The shape of the cornea can be determined by any conventional method. Among them, the corneal topography (corner topographer) or corneal keratoscope is used to observe the cornea without any examples. Any conventional method for extracting corneal topography data can be used. Suitable methods include, without limitation, the use of the Moire technique, the use of commercially available corneal topography measuring devices, and the like, and combinations thereof. In order to shape a lens using the topographical data, the data is mathematically converted into the height (elevat) on the average spherical surface of the cornea, and then the height data is converted into a grid pattern. The grid pattern can be in a straight, highly concentric, or spiral format that conforms to a mechanism that can be used to digitally control a lathe, milling machine, or digitally addressable device to process the rear surface of a lens or a lens mold or insert. Alternatively, the lens surface can be machined or turned using a programmable laser ablation device. The lenses of the present invention may be hard or soft contact lenses. Preferably, these lenses are also soft contact lenses. The lens of the present invention may have any characteristic of incorporating a plurality of bridged optical characteristics of a convex surface (front surface), a concave surface (rear surface), or both surfaces. For example, the lens may have any one or more of a spherical, aspherical, bifocal, multifocal, prismatic, or cylindrical bridge correction. The present invention can require at least one correction characteristic of the lens phase 5 10 15 20 25 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) 464605 A7 ------- B7_____ 5. Description of the Invention (if) The maximum effectiveness is found in lenses that maintain a stable eye orientation on the eye. In a preferred embodiment, the lens of the present invention is a toric soft contact lens, that is, a soft contact lens having a cylindrical optical surface (or power) for correcting astigmatism of the wearer. 5 In a more preferred embodiment, the lens is a lens customized for a particular lens wearer, such as a customized shape with contact lenses. These lenses can be provided by using eyepiece optical wavefront measurements, such as using a cylinder aberroscope [a cross-cylinder aberroscope] [a measurement of eyepiece modulation via a point or line distribution 10 transfer function (Modulation Transfer Function) or by using the output of any similar device that measures, estimates, interpolates, or calculates the optical wavefront of the eyepiece. Eyepiece optical wavefront information relates to the optical components of the eye 'including the cornea, lens, system length, inclination, eccentricity, asymmetry, irregularity, and asphericity of eye components. 15 The lens surface height or slope change required to achieve total eyepiece wavefront aberration correction can be applied only to the concave surface, only to the convex surface, or a combination of the two. The required surface height or slope change takes into account the height changes required to fit and correct irregularities in the corneal topography. In the case of a soft contact lens, since the soft lens covers the basic shape of the cornea, the total height change from the corneal topography 20 mapping and eyepiece wavefront aberration determination can be applied only to the convex surface, only to the concave surface, or both Of combination. In a preferred embodiment of a customized shape-matching lens, the conventional spherical-cylindrical prescription information can also be used to design a shaped lens. This information includes the telephoto spherical power, the telephoto aspheric cylinder power and the axis, and if necessary, the near and near power. This information can be determined using conventional subjective refraction techniques. This paper size applies to the national standard &CN; A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page)
I. n ^eJ K b— n n f I 經濟部智慧財產局員工消费合作社印製 經濟部智慧財產局貝工消费合作社印製 464605 A7 ----------B7_ 五、發明說明（夕） 另一種選擇’球面' 柱面和軸線可以一波前分析為基礎 判疋’此波岫分析例如藉由將哈特曼雪克（Hartmann Shack)波前資料化為澤爾尼克（Zernike)係數項且利 用相關項導出球面、柱面和軸線資訊完成。 5 雖然本發明之鏡片可為硬式或軟式鏡片，選來構成 本發明鏡#之材料最好是適合製造軟式隱形眼鏡的材 料°適合利用本發明方法構成軟式隱形眼鏡的較佳材料 非侷限性包括：矽嗣彈性體；含矽酮之大裂球 (raacromers > ’其中非侷限性包括美國專利第 10 5, 371，丨47 號、5, 314, 960 號和 5, 057, 578 號所揭示者， 該等專利就其全文納入參考；水凝膠；含矽酮之水凝膠 等及以上之組合。最好表面為一石夕氧貌或含有一碎氧烧 官能度，其中非侷限性包括：聚二甲基矽氧烷大裂球； 甲基丙烯氧丙基聚烷基矽氧烷；以上之混合物；矽酮水 15 说膠或一水凝黟（例如eta fi Icon A )。 就本發明之鏡片為軟式隱形眼鏡的案例來說，起先 高度資料為應用於一未撓曲狀態隱形眼鏡模型。隱形眼 鏡後表面最終造形為考慮到鏡片放置在眼睛上時鏡片撓 曲度或包覆度與角膜表面相符。一般而言，軟式鏡片比 20 其所要放置的角膜平坦。因此，在利用原始角膜形貌資 料製作一軟式隱形眼鏡表面或模具嵌入物時必須慮及高 度和包覆度。 撓曲轉換高度資料可繪製於一CNC網格圖案且用於 製造一鏡片或一造模工具表面。利用此等資訊完成之鏡 25 片會是在以鏡片中心軸對稱或非轴對稱之網格圖案呈現 本紙張尺度適用中國困家標準（CNS)A4規格（210 X 297公* ) C請先閱讀背面之注意事項再填寫本頁) 裝！ l·! — 訂·! !^- 464605 A7 五 10 15 20 25 ______B7___發明說明（G) 厚度波動的鏡片。當所製造軟式鏡片完美地包覆位於其 下的角膜時，表面高度的波動通常會消失。依此方式， 可抵銷角膜之不規則性且同樣可大致消弭因不規則角膜 形貌造成的光學像散。為達成任何附加光學矯正度數， 例如球面或散光聚焦，可在鏡月之前表面、後表面或前 後表面二者納入適當曲率。 為了實行上的考量，假設理想狀態的角膜為球面。 此時真實的角膜高度及其最佳球面配合就最小平方法觀 點來說分別由f(X)和g(x)表示。g(x)函數為一半徑 之球面的局部。 整體而言，未撓曲軟式隱形眼鏡的半徑！^為球面且 比最佳球面配合g(X)的半徑大。因此，第一步是將角膜 咼度f(X)轉換成會使最佳球面配合之半徑等於L的較 大比例。使此轉換簡化之一種方式是以極座標表現f (X) 函數成f(0)。然後，利用一比例因子α = ，角膜 南度之縮放後版本可表示為： f{l\e) = ccf{e) ( 1 ) 放大的角膜高度f…（0)經等比縮小使軟式鏡片 所覆蓋區域與角膜區域相符。在二維案例中，此等比縮 小依據下式關係獲得： /{2)(<5·) = α-7(，)[(^-π/2)/α + Λ-/2] + Λ2(ι_1/α^ ( 2) 在方程式U…2)中給出之映射轉換可推斷出 三維轉換的情況。在此案例中，角膜高度可由f( ) 函數表示’其中Θ和分別代表方位角和仰角。如前所 述，原始高度資料利用·下式轉換關係從—Θ，炉） 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） 464 60 5 A7 -------B7__ 五、發明說明（^ ) 曲率半徑等比放大於一具有0 )曲率半徑之表 面上： /[{){θ,φ)=〇^{θ,φ) ( g } (請先間讀背面之注意事項再填寫本頁) 其中 a = R2 ( 0，屮）/R, ( 0，$ )。 5 為獲得—期望之軟式隱形眼鏡後表面，f Η >( 0，炉： 函數如前所述等比縮小恢復。然而在三維案例中，就進 行縮放作業使其區域維持有數個選項可選。舉例來說， 倘若假設材料之變形為均勻徑向，縮放作業可藉由僅縮 放仰角而保留原始方位角之方式進行。此在下式關係中 10 表示： ί{2\θ,φ)=αλ/^[θΧα-π 12)1 a + π!2] + R^X-na) ( 4 ) 參照圖1，圖中顯示一習知軟式隱形眼鏡丨(^在一 典型具有不規則形狀之角膜上使用一習知鏡片的缺點在 於鏡片凸面Π採用角膜的不規則形狀。此等形狀採用使 15得比第一級高的像差難以矯正，從而提供一非最佳影 像。此外’在鏡片ώ面採用角膜形狀時，可能導致鏡片 在眼睛上的運動量加大。 經濟部智慧財產局貝工消費合作社印製 圖2中顯示一本發明軟式隱形眼鏡2〇 q鏡片2〇之 凹面21具有與角膜22相符的形狀。藉由提供此相符形 20狀使鏡片旋轉穩定。此外，鏡片凸面23不會採用角膜形 狀’使其有可能在必要時矯正較高等級之像散。 9 本紙張尺度適用中围國家標準（CNS)A4規格（210 X 297公釐） /160 5 A7 B7 五、發明說明（各） 圖示之代號說明 代表符號 10 11 20 21 22 23 名稱 習知軟式隱形眼鏡 鏡片凸面 本發明軟式隱形眼鏡 鏡片凹面 角膜 鏡片凸面 (請先閱讀背面之注意事項再填寫本頁)I. n ^ eJ K b— nnf I Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Sheller Consumer Cooperatives of the Ministry of Economic Affairs 464605 A7 ---------- B7_ ) Another option 'spherical surface' Cylinders and axes can be judged based on a wavefront analysis. 'This wavefront analysis is, for example, by transforming Hartmann Shack wavefront data into Zernike coefficients. And use the related terms to derive spherical, cylindrical, and axis information. 5 Although the lens of the present invention can be a hard or soft lens, the material selected to constitute the lens of the present invention is preferably a material suitable for the manufacture of soft contact lenses. The preferred materials suitable for the use of the method of the present invention to form soft contact lenses are not limited to include : Silicone elastomers; silicone-containing large lobes (raacromers > 'of which non-limitations include those disclosed in U.S. Patent Nos. 10 5, 371, 丨 47, 5, 314, 960, and 5, 057, 578 In addition, these patents are incorporated by reference in their entirety; hydrogels; silicone-containing hydrogels, etc. and combinations thereof. The best surface is a stone-like oxygen appearance or contains a broken oxygen burning functionality, among which non-limiting include : Polydimethylsiloxane spar; methacryloxypropyl polyalkylsiloxane; mixtures of the above; silicone water 15 or gel (eg eta fi Icon A). For the case where the lens of the invention is a soft contact lens, the initial height data is applied to an undeflected contact lens model. The rear surface of the contact lens is finally shaped to take into account the lens deflection or coverage when the lens is placed on the eye Similar to corneal surface In general, soft lenses are flatter than the cornea where they are placed. Therefore, the height and coverage must be considered when making a soft contact lens surface or mold insert from the original corneal topography. The data can be drawn on a CNC grid pattern and used to manufacture a lens or a mold tool surface. The 25 lenses completed using this information will be presented on the paper in a grid pattern that is symmetrical or non-axisymmetric to the center of the lens The dimensions are applicable to the Chinese Standard for Household Standards (CNS) A4 (210 X 297 male *) C Please read the precautions on the back before filling in this page) Install! l ·! — Order ·!! ^-464605 A7 Five 10 15 20 25 ______B7___ Description of the invention (G) Lens with fluctuating thickness. When the manufactured soft lens perfectly covers the underlying cornea, fluctuations in surface height usually disappear. In this way, the irregularity of the cornea can be offset and the optical astigmatism caused by the irregular shape of the cornea can also be substantially eliminated. To achieve any additional optical correction, such as spherical or astigmatic focusing, appropriate curvature can be incorporated into the front, rear, or front and rear surfaces of the mirror. For practical considerations, the ideal cornea is assumed to be spherical. At this time, the true corneal height and its optimal spherical fit are represented by f (X) and g (x), respectively, from the viewpoint of the least square method. The g (x) function is a part of a spherical surface with a radius. Overall, the radius of undeflected soft contact lenses! ^ Is spherical and has a radius larger than the optimal spherical fit g (X). Therefore, the first step is to convert the corneal angle f (X) into a larger proportion that will make the radius of the best spherical fit equal to L. One way to simplify this conversion is to express the f (X) function as f (0) in polar coordinates. Then, using a scale factor α =, the scaled version of the south of the cornea can be expressed as: f {l \ e) = ccf {e) (1) The magnified corneal height f ... (0) is reduced by an equal ratio to make the soft lens The area covered corresponds to the corneal area. In the two-dimensional case, the reduction of these ratios is obtained according to the following relationship: / {2) (< 5 ·) = α-7 (,) [(^-π / 2) / α + Λ- / 2] + Λ2 (ι_1 / α ^ (2) The mapping transformation given in equation U ... 2) can infer the situation of three-dimensional transformation. In this case, the corneal height can be represented by the f () function, where Θ and azimuth represent azimuth and elevation, respectively. As mentioned earlier, the use of original height data and the following formula convert the relationship from -Θ, furnace) This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 public love) 464 60 5 A7 ------- B7__ 5. Description of the invention (^) The curvature radius is proportionally enlarged on a surface with a curvature radius of 0): / [{) {θ, φ) = 〇 ^ {θ, φ) (g) (Please read the back first Please fill in this page again)) where a = R2 (0, 屮) / R, (0, $). 5 In order to obtain—the desired rear surface of the soft contact lens, f Η > (0, furnace: function as before The ratio reduction is restored. However, in the three-dimensional case, there are several options for maintaining the area to perform the scaling operation. For example, if the deformation of the material is assumed to be uniform radial, the scaling operation can be performed by only scaling the elevation angle. Keep the original azimuth. This is represented by 10 in the following relationship: ί {2 \ θ, φ) = αλ / ^ [θχα-π 12) 1 a + π! 2] + R ^ X-na) (4 ) Referring to FIG. 1, a conventional soft contact lens is shown in the figure. ^ The disadvantage of using a conventional lens on a typical cornea with an irregular shape is that the convex surface of the lens uses an angle. Irregular shapes. These shapes use aberrations that make 15 higher than the first level difficult to correct, thereby providing a non-optimal image. In addition, when the corneal shape is used on the lens surface, it may cause lens movement on the eye. Printed by the Shelley Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, FIG. 2 shows that the concave surface 21 of the soft contact lens 20q lens 20 of the present invention has a shape conforming to the cornea 22. By providing this conforming shape 20, The lens is stable in rotation. In addition, the convex surface 23 of the lens will not adopt the shape of a cornea, making it possible to correct a higher level of astigmatism when necessary. ) / 160 5 A7 B7 V. Description of the invention (each) Symbol of the description of the symbol 10 11 20 21 22 23 Name Conventional soft contact lens lens convex surface The soft contact lens lens concave corneal lens convex surface of the present invention (please read the back (Please fill in this page again)
I n n a— n 一DJ t n I I 經濟部智慧財產局員工消費合作杜印製 本紙張尺度適用辛國國家標準（CNS)A4規格（210 X 297公釐）I n n a— n a DJ t n I I Printed by the consumer cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs. The paper size is applicable to the National Standard (CNS) A4 (210 X 297 mm).