LETTER
E ec o cylinde powe and axis changes on
ision in as igma ic pa icipan s: a commen
[Le e ]
This a icle was published in he ollowing Do e P ess jou nal:
Clinical Op ome y
Lau a Remón
1
Wal e D Fu lan
2
1
Depa amen o de Física Aplicada,
Uni e sidad de Za agoza, 50009
Za agoza, Spain;
2
Depa amen o de
Óp ica y Op ome ía y Ciencias de la
Visión, Uni e si a de València, 46100
Bu jasso , Spain
Dea edi o
We ead wi h in e es he a icle by Sha e al
1
in he Ma ch 2019 issue. This
s udy e alua ed he e ec s o misalignmen axis and unde co ec ing cylinde
powe s on he isual pe o mance o as igma ic people. The aim o his wo k
was mainly o assis eye-ca e p ac i ione s in educing he numbe o o ic
con ac lenses s ock-keeping uni s. The au ho s analyze he e ec o as ig-
ma ic unde co ec ion by 0.25, 0.50 and 0.75 DC, a di e en amoun s o
misalignmen s up o 30°. In his analysis, he e ec s o cylinde powe ,
cylinde axis and hei mu ual in e ac ion a e analyzed sepa a ely. Howe e ,
i is well known ha cylinde powe and axis a e no independen a iables; in
ac , as igma ism is a ec o magni ude. Se e al s udies
2,4
use ec o o mal-
ism o quan i y he blu s eng h p oduced by as igma ism. E en in p e ious
li e a u e,
1
he au ho s show he powe ec o componen s (M, J
0
,J
45
)in
Table 1, o he di e en g oups in which he sample is di ided. Howe e ,
unexpec edly, hey do no use he same o malism o analyze he da a (see
Tables 2, 3 and Figu es 2–6). In his sense, in ou opinion, i would ha e been
much use ul o show he esul s o he e alua ed isual pa ame e s in e ms
o a single scala a iable such as he blu s eng h (B¼ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi
ðM2þJ2
0þJ2
45Þ
q).
This could ha e been done by compu ing he modulus o he ec o di e ence
be ween he ull co ec ion and he di e en simula ed misco ec ions, and
hen ep esen ing he di e en pa ame e s o in e es (HCVA, LCVA, e c.) s
he blu s eng h. In his way, he a e o change o each pa ame e pe uni
blu s eng h could ha e been compu ed.
2
F om he da a in e e ence [1]
(Figu e 2 and Table 1), co esponding o high cylinde g oup HCVA, we
ound ha he fi e y well wi h he exp ession: logMAR =0.37 B−0.1
which is he empi ical equa ion ha we ound p e iously,
3
which is also
men ioned in e e ence [2].
Finally, i is impo an o no e ha , like happens o he HCVA,
4
he a e o
change o he o he isual pa ame e s wi h he blu s eng h may depend on he ype
o esidual as igma ism, and also on he ampli ude o accommoda ion o he
pa icipan s. This may be one o he easons o he di e en slopes in he da a
co esponding o unde co ec ion by 0.75 DC in he abo e-men ioned Figu e 2
(do ed line).
Co espondence: Lau a Remón
Depa amen o de Física Aplicada,
Facul ad de Ciencias, Uni e sidad de
Za agoza, C/ Ped o Ce buna, 12,
Za agoza 50009, Spain
Email lau ema @uniza .es
Clinical Op ome y Do ep ess
open access o scien ific and medical esea ch
Open Access Full Tex A icle
submi you manusc ip | www.do ep ess.com Clinical Op ome y 2019:11 63–64 63
Do eP ess © 2019 Remón and Fu lan. This wo k is published and licensed by Do e Medical P ess Limi ed. The ull e ms o his license a e a ailable a h ps://www.do ep ess.com/
e ms.php and inco po a e he C ea i e Commons A ibu ion –Non Comme cial (unpo ed, 3.0) License (h p://c ea i ecommons.o g/licenses/by-nc/3.0/). By accessing
he wo k you he eby accep he Te ms. Non-comme cial uses o he wo k a e pe mi ed wi hou any u he pe mission om Do e Medical P ess Limi ed, p o ided he wo k is p ope ly a ibu ed.
Fo pe mission o comme cial use o his wo k, please see pa ag aphs 4.2 and 5 o ou Te ms (h ps://www.do ep ess.com/ e ms.php).
h p://doi.o g/10.2147/OPTO.S212510
Clinical Op ome y downloaded om h ps://www.do ep ess.com/ by 155.210.59.210 on 20-Feb-2021
Fo pe sonal use only.
Powe ed by TCPDF (www. cpd .o g)
1 / 1
In conclusion, by using he ec o powe o malism,
p ac i ione s could ob ain he answe o he ollowing
ques ion: Which is he maximum ole able di e ence in
he amoun o blu s eng h (B) be ween 2 lenses in my
s ock? This esul would ce ainly be use ul o “assis in
de e mining oppo uni ies o educing s ock-keeping uni s
o o ic con ac lens”.
Disclosu e
The au ho s epo no conflic s o in e es in his
communica ion.
Re e ences
1. Sha J, Fed ke C, Tilia D, e al. E ec o cylinde powe and axis
changes on ision in as igma ic pa icipan s. Clin Op om.
2019;11:27–38. doi:10.2147/OPTO.S190120
2. A chison DA, Ma hu A. Visual acui y wi h as igma ic blu . Op om
Vis Sci.2011;88(7):E798–E805. doi:10.1097/OPX.0b013e31821
98792
3. Remón L, To nel M, Fu lan WD. Visual acui y in simple myopic
as igma ism: influence o cylinde axis. Op om Vis Sci.2006;83
(5):311–315. doi:10.1097/01.opx.0000197958.83213.b1
4. Remón L, Monso iu JA, Fu lan WD. Influence o di e en ypes o
as igma ism on isual acui y. J Op om.2017;10(3):141–148.
doi:10.1016/j.op om.2016.07.003
Do e Medical P ess encou ages esponsible, ee and ank academic deba e. The con en o he Clinical Op ome y ‘le e s o he edi o ’sec ion does no necessa ily ep esen he
iews o Do e Medical P ess, i s office s, agen s, employees, ela ed en i ies o he Clinical Op ome y edi o s. While all easonable s eps ha e been aken o confi m he con en o each
le e , Do e Medical P ess accep s no liabili y in espec o he con en o any le e , no is i esponsible o he con en and accu acy o any le e o he edi o .
Clinical Op ome y Do ep ess
Publish you wo k in his jou nal
Clinical Op ome y is an in e na ional, pee - e iewed, open access
jou nal publishing o iginal esea ch, basic science, clinical and
epidemiological s udies, e iews and e alua ions on clinical op o-
me y. All aspec s o pa ien ca e a e add essed wi hin he jou nal as
well as he p ac ice o op ome y including economic and business
analyses. Basic and clinical esea ch pape s a e published ha co e
all aspec s o op ics, e ac ion and i s applica ion o he heo y and
p ac ice o op ome y. The manusc ip managemen sys em is
comple ely online and includes a e y quick and ai pee - e iew
sys em, which is all easy o use. Visi h p://www.do ep ess.com/
es imonials.php o ead eal quo es om published au ho s.
Submi you manusc ip he e: h ps://www.do ep ess.com/clinical-op ome y-jou nal
Remón and Fu lan Do ep ess
submi you manusc ip | www.do ep ess.com
Do eP ess
Clinical Op ome y 2019:11
64
Clinical Op ome y downloaded om h ps://www.do ep ess.com/ by 155.210.59.210 on 20-Feb-2021
Fo pe sonal use only.
Powe ed by TCPDF (www. cpd .o g)
1 / 1