diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Revision history for base64-lens
 
+## 0.3
+
+* Instead of focusing on the `Base64Lenient` `Iso` as a `Lens` (which swaps its focus compared to its sibling `Prism`s),
+  change it to be symmetrical with the other `Prism`s so that it can be used as a generalized `Prism`.
+
 ## 0.2
 
 * Bump `base64` dependency to settle on 0.4 with the "finalized" api.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -13,20 +13,14 @@
 pattern Base64 :: ByteString -> ByteString
 pattern Base64Url :: ByteString -> ByteString
 pattern Base64UrlUnpadded :: ByteString -> ByteString
+pattern Base64Lenient :: ByteString -> ByteString
+pattern Base64UrlLenient :: ByteString -> ByteString
 
--- and
+-- and 
 
 pattern Base64 :: Text -> Text
 pattern Base64Url :: Text -> Text
 pattern Base64UrlUnpadded :: Text -> Text
-
--- additionally if using >=base64-0.3
-
-pattern Base64Lenient :: ByteString -> ByteString
-pattern Base64UrlLenient :: ByteString -> ByteString
-
--- and
-
 pattern Base64Lenient :: Text -> Text
 pattern Base64UrlLenient :: Text -> Text
 ```
@@ -43,20 +37,14 @@
 _Base64 :: Prism' ByteString ByteString
 _Base64Url :: Prism' ByteString ByteString
 _Base64UrlUnpadded :: Prism' ByteString ByteString
+_Base64Lenient :: Iso' ByteString ByteString
+_Base64UrlLenient :: Iso' ByteString ByteString
 
 -- and
 
 _Base64 :: Prism' Text Text
 _Base64Url :: Prism' Text Text
 _Base64UrlUnpadded :: Prism' Text Text
-
--- additionally if using >=base64-0.3
-
-_Base64Lenient :: Iso' ByteString ByteString
-_Base64UrlLenient :: Iso' ByteString ByteString
-
--- and
-
 _Base64Lenient :: Iso' Text Text
 _Base64UrlLenient :: Iso' Text Text
 ```
diff --git a/base64-lens.cabal b/base64-lens.cabal
--- a/base64-lens.cabal
+++ b/base64-lens.cabal
@@ -1,7 +1,7 @@
 cabal-version:       1.24
 
 name:                base64-lens
-version:             0.2.0
+version:             0.3.0
 synopsis:            Optics for the Base64 library
 description:
   Prisms and pattern synonyms for the Base64 library
@@ -39,7 +39,7 @@
   build-depends:       base       >=4.10 && <5
                      , base64     >=0.4  && <0.5
                      , bytestring >=0.10 && <0.11
-                     , lens       >=4.0  && <4.19
+                     , lens       >=4.0  && <5
                      , text       >=1.2  && <1.3
 
   hs-source-dirs:      src
diff --git a/src/Data/ByteString/Base64/Lens.hs b/src/Data/ByteString/Base64/Lens.hs
--- a/src/Data/ByteString/Base64/Lens.hs
+++ b/src/Data/ByteString/Base64/Lens.hs
@@ -9,7 +9,7 @@
 -- Stability	: Experimental
 -- Portability	: non-portable
 --
--- This module contains 'Prism''s for Base64-encoding and
+-- This module contains 'Prism''s and 'Iso''s for Base64-encoding and
 -- decoding 'ByteString' values.
 --
 module Data.ByteString.Base64.Lens
@@ -97,31 +97,31 @@
 -- using lenient decoding.
 --
 --
--- _Note:_ This is not a lawful 'Iso'.
+-- _Note:_ This is not a lawful 'Iso'. Please take care!
 --
--- >>> "Sun" ^. _Base64Lenient
+-- >>> _Base64Lenient # "Sun"
 -- "U3Vu"
 --
--- >>> "U3Vu" ^. from _Base64Lenient
+-- >>> "U3Vu" ^. _Base64Lenient
 -- "Sun"
 --
 _Base64Lenient :: Iso' ByteString ByteString
-_Base64Lenient = iso B64.encodeBase64' B64.decodeBase64Lenient
+_Base64Lenient = iso B64.decodeBase64Lenient B64.encodeBase64'
 
 -- | An 'Iso'' into the Base64url encoding of a 'ByteString' value
 -- using lenient decoding.
 --
 --
--- _Note:_ This is not a lawful 'Iso'.
+-- _Note:_ This is not a lawful 'Iso'. Please take care!
 --
--- >>> "<<??>>" ^. _Base64UrlLenient
+-- >>> _Base64UrlLenient # "<<??>>"
 -- "PDw_Pz4-"
 --
--- >>> "PDw_Pz4-" ^. from _Base64UrlLenient
+-- >>> "PDw_Pz4-" ^. _Base64UrlLenient
 -- "<<??>>"
 --
 _Base64UrlLenient :: Iso' ByteString ByteString
-_Base64UrlLenient = iso B64U.encodeBase64' B64U.decodeBase64Lenient
+_Base64UrlLenient = iso B64U.decodeBase64Lenient B64U.encodeBase64'
 
 -- -------------------------------------------------------------------------- --
 -- Patterns
diff --git a/src/Data/Text/Encoding/Base64/Lens.hs b/src/Data/Text/Encoding/Base64/Lens.hs
--- a/src/Data/Text/Encoding/Base64/Lens.hs
+++ b/src/Data/Text/Encoding/Base64/Lens.hs
@@ -9,7 +9,7 @@
 -- Stability	: Experimental
 -- Portability	: non-portable
 --
--- This module contains 'Prism's Base64-encoding and
+-- This module contains 'Prism's and 'Iso''s Base64-encoding and
 -- decoding 'Text' values.
 --
 module Data.Text.Encoding.Base64.Lens
@@ -95,31 +95,31 @@
 -- using lenient decoding.
 --
 --
--- _Note:_ This is not a lawful 'Iso'.
+-- _Note:_ This is not a lawful 'Iso' in general. Please take care!
 --
--- >>> "Sun" ^. _Base64Lenient
+-- >>> _Base64Lenient # "Sun"
 -- "U3Vu"
 --
--- >>> "U3Vu" ^. from _Base64Lenient
+-- >>> "U3Vu" ^. _Base64Lenient
 -- "Sun"
 --
 _Base64Lenient :: Iso' Text Text
-_Base64Lenient = iso B64T.encodeBase64 B64T.decodeBase64Lenient
+_Base64Lenient = iso B64T.decodeBase64Lenient B64T.encodeBase64
 
 -- | An 'Iso'' into the Base64url encoding of a 'Text' value
 -- using lenient decoding.
 --
 --
--- _Note:_ This is not a lawful 'Iso'.
+-- _Note:_ This is not a lawful 'Iso' in general. Please take care!
 --
--- >>> "<<??>>" ^. _Base64UrlLenient
+-- >>> _Base64UrlLenient # "<<??>>"
 -- "PDw_Pz4-"
 --
--- >>> "PDw_Pz4-" ^. from _Base64UrlLenient
+-- >>> "PDw_Pz4-" ^. _Base64UrlLenient
 -- "<<??>>"
 --
 _Base64UrlLenient :: Iso' Text Text
-_Base64UrlLenient = iso B64TU.encodeBase64 B64TU.decodeBase64Lenient
+_Base64UrlLenient = iso B64TU.decodeBase64Lenient B64TU.encodeBase64
 
 -- -------------------------------------------------------------------------- --
 -- Patterns