巴打,如果學生哥平平地想買副好睇啲既眼鏡,好似眉架果啲
有冇邊度好介紹?
住邊頭先
沙田 其實邊到都OK
賣咗十年眼鏡，您問我答（4）
羅嚴克拉姆殿下
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沙田 其實邊到都OK
Prentice rule 其實有limitation
我見師兄是理性的 所以會quote比你睇
Consider the case of a plano ophthalmic lens having a convex curve of +6.00 diopters (1.53), a center thickness of 2.2mm, and fabricated of crown glass having an index of 1.523. If we perform the calculations, we find that the rear curve must be steeper than -6.00 diopters if the lens is to have zero power.
If Prentice’s Rule doesn’t work for plano lenses, or for that matter for lenses near plano, how do we determine the amount of prism introduced by moving away from the optical center of such lenses? The answer is that we must involve the radii of the specific curves employed. Before discussing the equations used to perform such calculations, thus risking the loss of those readers who don’t enjoy trigonometry, let’s see how much prism is really introduced by moving 10mm away from the optical center of our plano and equi-sided examples.
咁再derive之後
On reviewing this paper, one of my colleagues pointed out that it is possible to derive a generalized version of Prentice’s Rule which, while slightly more involved than the original version, avoids trigonometric expressions and works well for low powers. Indeed, for the weaker powers where Prentice’s Rule breaks down, the involved angles become small enough so that we can let the sine of the angle equal the angle itself. By so doing, we derive the following equations:
∆ = 100(P1 +P2 - t P1 +P2) x (n-1)
x
=
or
∆__________
Where:
P1 =
P2 =
t = x = ∆ =
True Front Surface Power True Rear Surface Power
Center Thickness (meters) Decentration (meters) Prism (prism diopters)
100(P1 +P2 - t (n-1)
P1 +P2)
= 1000 (n-1) R1
= 1000 (n-1) R2
Note:
P1 and P2 are true surface powers (not 1.53 powers). In the usual situation where the rear surface is concave, P2 should be considered a minus quantity in these equations.
For all low powered ophthalmic lenses, and even for most higher powers, the above equations provide more accuracy than can be achieved with the usual version of Prentice’s Rule. For weak lenses, these equations are sufficiently accurate for most any practical ophthalmic application.
咁即係話面灣係contribute to 個distortion
咁只要做到freeform 就work
我見師兄是理性的 所以會quote比你睇
Consider the case of a plano ophthalmic lens having a convex curve of +6.00 diopters (1.53), a center thickness of 2.2mm, and fabricated of crown glass having an index of 1.523. If we perform the calculations, we find that the rear curve must be steeper than -6.00 diopters if the lens is to have zero power.
If Prentice’s Rule doesn’t work for plano lenses, or for that matter for lenses near plano, how do we determine the amount of prism introduced by moving away from the optical center of such lenses? The answer is that we must involve the radii of the specific curves employed. Before discussing the equations used to perform such calculations, thus risking the loss of those readers who don’t enjoy trigonometry, let’s see how much prism is really introduced by moving 10mm away from the optical center of our plano and equi-sided examples.
咁再derive之後
On reviewing this paper, one of my colleagues pointed out that it is possible to derive a generalized version of Prentice’s Rule which, while slightly more involved than the original version, avoids trigonometric expressions and works well for low powers. Indeed, for the weaker powers where Prentice’s Rule breaks down, the involved angles become small enough so that we can let the sine of the angle equal the angle itself. By so doing, we derive the following equations:
∆ = 100(P1 +P2 - t P1 +P2) x (n-1)
x
=
or
∆__________
Where:
P1 =
P2 =
t = x = ∆ =
True Front Surface Power True Rear Surface Power
Center Thickness (meters) Decentration (meters) Prism (prism diopters)
100(P1 +P2 - t (n-1)
P1 +P2)
= 1000 (n-1) R1
= 1000 (n-1) R2
Note:
P1 and P2 are true surface powers (not 1.53 powers). In the usual situation where the rear surface is concave, P2 should be considered a minus quantity in these equations.
For all low powered ophthalmic lenses, and even for most higher powers, the above equations provide more accuracy than can be achieved with the usual version of Prentice’s Rule. For weak lenses, these equations are sufficiently accurate for most any practical ophthalmic application.
咁即係話面灣係contribute to 個distortion
咁只要做到freeform 就work
另外想請教吓Seiko隻A-Zone個設計係點呢
冇乜賣明記啲嘢唔係好了解
就咁睇落同佢sportech果種做法相似
http://www.seiko-opt.co.jp/en/technology/zone/
話時話視光師巴打打算做診所定舖頭？
開緊鋪
巴打,如果學生哥平平地想買副好睇啲既眼鏡,好似眉架果啲
有冇邊度好介紹?
住邊頭先
沙田 其實邊到都OK
Pm me
借位做吓雞仔媒人，無錢收的：
有地方搵part4, 單牌
另外我公司都搵緊Part 1
薪酬待遇我一概唔知，純粹幫朋友問吓
你公司出名搵一仔入股
應該唔難搵
Part4 加哂價
一工1200up
我想問想做 視光師 要什麼學歷
我想問想做 視光師 要什麼學歷
香港讀就poly
加拿大澳洲美國都ok
邊度配眼鏡好? EGG好唔好?
全視線鏡片點揀，大約咩價位
全視線鏡片點揀，大約咩價位
邊度配眼鏡好? EGG好唔好?
全視線鏡片點揀，大約咩價位
價鈛
錢Tg 問吧
...we derive the following equations:
∆ = 100(P1 +P2 - t P1 +P2) x (n-1)
x
=
or
∆__________
Where:
P1 =
P2 =
t = x = ∆ =
True Front Surface Power True Rear Surface Power
Center Thickness (meters) Decentration (meters) Prism (prism diopters)
100(P1 +P2 - t (n-1)
P1 +P2)
= 1000 (n-1) R1
= 1000 (n-1) R2
Note:
P1 and P2 are true surface powers (not 1.53 powers). In the usual situation where the rear surface is concave, P2 should be considered a minus quantity in these equations.
For all low powered ophthalmic lenses, and even for most higher powers, the above equations provide more accuracy than can be achieved with the usual version...
因為copy上嚟啲位會有啲亂
所以放幅圖上嚟方便討論
其實呢條formula係解釋咗淺度數時鏡片點樣產生棱鏡
同時證明咗除咗面彎外底彎都會影響棱鏡度數
換句話講深度數嘅人如果想塊面冇縮得咁多
單面非球面嘅效果唔大
反而雙非球面就會幫到手
咁我明明哋隻A-Zone個Stylish Zone係咩原理喇
(其實要塊面冇縮咁多最實際都係揀隻細啲嘅架
)...we derive the following equations:
∆ = 100(P1 +P2 - t P1 +P2) x (n-1)
x
=
or
∆__________
Where:
P1 =
P2 =
t = x = ∆ =
True Front Surface Power True Rear Surface Power
Center Thickness (meters) Decentration (meters) Prism (prism diopters)
100(P1 +P2 - t (n-1)
P1 +P2)
= 1000 (n-1) R1
= 1000 (n-1) R2
Note:
P1 and P2 are true surface powers (not 1.53 powers). In the usual situation where the rear surface is concave, P2 should be considered a minus quantity in these equations.
For all low powered ophthalmic lenses, and even for most higher powers, the above equations provide more accuracy than can be achieved with the usual version...
因為copy上嚟啲位會有啲亂
所以放幅圖上嚟方便討論
其實呢條formula係解釋咗淺度數時鏡片點樣產生棱鏡
同時證明咗除咗面彎外底彎都會影響棱鏡度數
換句話講深度數嘅人如果想塊面冇縮得咁多
單面非球面嘅效果唔大
反而雙非球面就會幫到手
咁我明明哋隻A-Zone個Stylish Zone係咩原理喇
(其實要塊面冇縮咁多最實際都係揀隻細啲嘅架
啱啦巴打
明明optom得一千人
硬係唔明點解成日都有d人唔信日本仔既研究
例如藍光 雙非
你係明白事理的師兄
而家興大框/本身佢70pd
咁就冇細框了
咁就冇細框了
巴打,如果學生哥平平地想買副好睇啲既眼鏡,好似眉架果啲
有冇邊度好介紹?
住邊頭先
沙田 其實邊到都OK
Pm me
巴打 我都想平平地配多副靚仔d既眼鏡 可以點pm你
Moscot 眼鏡框點睇？
Moscot 眼鏡框點睇？
Visual xx 獨家行貨
要既都可幫忙
借位做吓雞仔媒人，無錢收的：
有地方搵part4, 單牌
另外我公司都搵緊Part 1
薪酬待遇我一概唔知，純粹幫朋友問吓
你公司出名搵一仔入股
應該唔難搵
Part4 加哂價
一工1200up
Part1一工幾多
Moscot 眼鏡框點睇？
Visual xx 獨家行貨
要既都可幫忙
大陸製 不了
Moscot 眼鏡框點睇？
Visual xx 獨家行貨
要既都可幫忙
大陸製 不了
基本上各大品牌都拆到貨
借位做吓雞仔媒人，無錢收的：
有地方搵part4, 單牌
另外我公司都搵緊Part 1
薪酬待遇我一概唔知，純粹幫朋友問吓
你公司出名搵一仔入股
應該唔難搵
Part4 加哂價
一工1200up
Part1一工幾多
上次我個fd 開我1800
巴打，想問下隱形眼鏡邊隻平?
門外漢一問
想換眼鏡應該平框貴鏡？
自己想配副rayban 應該邊到買最抵
或者有無啲半框眼鏡既牌子推介 thx
想換眼鏡應該平框貴鏡？
自己想配副rayban 應該邊到買最抵
或者有無啲半框眼鏡既牌子推介 thx
門外漢一問
想換眼鏡應該平框貴鏡？
自己想配副rayban 應該邊到買最抵
或者有無啲半框眼鏡既牌子推介 thx
睇你要求同度數
平架貴架
反正是個容器
鏡片才是主角
價錢想問
Tg 我
門外漢一問
想換眼鏡應該平框貴鏡？
自己想配副rayban 應該邊到買最抵
或者有無啲半框眼鏡既牌子推介 thx
睇你要求同度數
平架貴架
反正是個容器
鏡片才是主角
價錢想問
Tg 我
鏡片係主角
但個舞台係爛嘅話
就算搵齊影帝影后都冇用
所以互相匹配先最重要
對鏡貴副架都唔可以太差
Moscot 眼鏡框點睇？
料一般般，兩千銀有更好選擇