跳蛛以其優秀的視覺，引導牠能夠做出精準快速的獵食動作，這正是牠們與其他蜘蛛最大的區別，而優秀且獨特的視覺系統也是許多科學家研究的對象。跳蛛的一對主眼與三對次眼的胚胎發育過程與內部生理構造皆不相同，對跳蛛行為的支持上也扮演著不同的角色，然而，眼角膜的結構與功能卻是較少被提及的。由肉眼觀察某些跳蛛物種發現主眼和次眼呈現不同的顏色，也存在著種間差異，因此，本研究想要了解跳蛛主眼(又可被稱前中眼)與三對次眼中的前側眼的眼角膜反射光譜的差異性。
另外，角膜表面乳突陣列(corneal nipple array)為大多數節肢動物眼角膜表面所具有的奈米級結構，角膜乳突陣列提供多種功能，其中之一就是影響光線進入角膜時的反、折射率，而已有應用物理學的研究證實了不同尺寸的奈米結構的確會改變反射光譜的組成，因此，本研究想要了解跳蛛的眼角膜表面奈米結構是否與其反射光譜的差異有關。
結果顯示某些跳蛛前中眼(anterior medial eyes, AMEs)和前側眼(anterior lateral eyes, ALEs)的反射光譜在可見光波段內的最高反射波峰有顯著的差異，AMEs的反射光譜呈現多元的種間差異，最高反射波峰在短、中、長波段皆有，而ALEs的最高反射率波峰則通通位於中波長波段。眼角膜表面結構在AMEs和ALEs也有所不同，AMEs的表面溝槽較ALEs來的矮小，且同樣有種間差異的存在。
本研究顯示了跳蛛AMEs與ALEs的眼角膜反射光譜與表面奈米結構的多元性與種間差異，這結果暗示了眼角膜對於跳蛛來說可能存在著某種潛在功能，可能能夠提供跳蛛在不同環境下有不同的優勢。然而，利用應用物理或數學模型等來提供更多證據來釐清兩者之間的關聯性。

The anterior medial eyes (AMEs) and the anterior lateral eyes (ALEs) are two of the four pairs of eyes, which are located at the front of the cephalothorax of jumping spiders (Araneae: Salticidae). The development process, physiological structures, and practical functions of these two types of eyes are well studied (Land, 1985a). The transmittance of corneas of jumping spiders might have interspecies differences (Hu et al., 2012). However, the mechanisms behind such differences remained unclear. Here we show corneal reflectance spectra and nanostructures of AMEs and ALEs of five salticid species. Similar to transmittance spectra, the reflectance spectra of AMEs’ corneas also vary among species. In contrast, the spectral reflectances of ALEs’ corneas show similar peaks at around middle-wavelengths (~560 nm). Parallel nano-grooves are found in all of the corneal surfaces, but the grooves of AMEs are significantly narrower and shallower than those of ALEs. In addition, we also find there are interspecies variations in grooves’ dimensions on both AMEs and ALEs. Our results demonstrate the diversity of corneal spectra and nanostructures not only between two types of eyes but also between species. That is to say the corneas of jumping spiders may have some hidden functions. More evidences on applied physics or mathematics should confirm the relationships, if any, between corneal reflectance spectra and dimensions of nanostructures.

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